The show starts with Jung Suk (Ha Seok Jin) having a beer and some crab meat at a bar. We get to hear his 3 rules again. Meanwhile, at home Ha Na (Park Ha Sun) sees his Instagram feed and notices that he’s stuffing his face and wonders if it’s something to brag about. She decides to have crab meat with her beer too. She sits down with crab flavour chips and enjoys them with her beer.
The next day, Ha Na is in the washroom when she has to go to the stall for toilet paper to draw her hands. She overhears two students talking about the post about Jung Suk’s academic background. Jin Yi (Hwang Woo Seul Hye) shows up and the students scatter. Jin Yi comes out and greets her hello. She asks if she heard what the girls were talking abut. Jin Yi tells her to ignore it because there are always rumours floating around when you become successful. Jin Yi then mentions that she looks haggard and touches up her makeup.
They go out to find Won Hae (Kim Won Hae) fawning over Jung Suk because 1000 students signed up for his classes. When Won Hae goes in for a hug, Jung Suk ducks and walks away. Jin Yi asks about her classes and finds out that 150 signed up for hers. When Ji Woong (Min Ji Woong) asks about his class, everyone turns to find him in army fatigues. (2nd reference to Descendent’s of Sun maybe?) Won Hae chastises him but tells him that he broke even.
In the teacher’s lounge, Ha Na is reeling that she only got 10 students, which barely breaks even for her. Jin Yi tells her that 10 students isn’t bad since it’s her 1st month and didn’t get any promotions. Jung Suk tells her that 10 students isn’t bad since she’s No Geu Rae. Jung Suk has to explain it to everyone but Won Hae links it to Jang Geu Rae from Misaeng and everyone starts to laugh. (I feel like I missed something…)
Dong Young (Kim Dong Young) gets a text telling him that his sister deposited 50,000 won into his bank account. He wonders how long he’s going to need the support of his family to study the way he is. He tells himself that he will pass the next exam for his family and for Joo Yeon.
Dong Young goes into Ki Bum’s room (Key) to wake up but to find him in the shower. He jumps and asks Dong Young why he’s there. Dong Young admits it’s to wake him up but he’s already awake. Ki Bum tells him that he’s obviously awake and tells Dong Young to get out of his room. Dong Young mentions that it’s not like he has something he doesn’t and leaves the room.
Ha Na is walking to her class when she notices Jung Suk’s is in session. She looks in and is amazed by how many students are in the room. She tells herself that one day her room with be full like that and he can just watch and see.
While walking to class Dong Young and Ki Bum witness a boy trying to get Chae Yeon’s (Jung Chae Yeon) number. She refuses and when he insists she takes his and throws it in the trash. She chastises him for not studying. Dong Young mentions that people find even girls like that attractive because all that matters is looks. Ki Bum tells him that there is no way people find her pretty just the most hated.
Once in class Ki Bum tells Dong Young that a real beauty is more like the teacher of that class and anyone who isn’t like her isn’t a beauty. Chae Yeon mentions that it should like he’s at an idol concert. He tells her that even if he is she can mind her own business. hHa Na comes in and Ki Bum’s hopes are shattered.
Ha Na comes out and gives the mic back to Dong Young, Jung Suk comes by and asks what she needs a mic for as she only has 10 students. She tells him that even though it’s 10 now, he can just watch and see her fill her lecture hall. She walks away and he wonders why she’s talking so big.
While walking away Ha Na tells herself that she was the favourite teacher at the academy that she taught at and no one dropped her class. Just then she hears someone wanting to drop her class. Ki Bum wants a refund because he was expecting a beauty and if he wanted to look at someone who wasn’t pretty he would have taken professor Lee’s class since she’s the best Korean teacher. Won Hae overhears him and chastises Ki Bum before leaving with professor Lee. Ki Bum returns to asking for a refund. Ha Na comes to him and apologises to Ki Bum and pulls him aside.
She takes Ki Bum and Dong Young out to eat and asks him what is wrong with her. He tells her that nothing is wrong but the photoshopped her. She tells him that she just wasn’t prepared that day and is normally prettier. He doesn’t believe that she can be. Dong Young leaves and Ha Na goes to get more pickles and notices Jung Suk.
Ha Na hides and wonders if Jung Suk heard everything and now he thinks that she’s going to raise up through flattery. The misunderstanding now looks like reality. Her phone start talking back and she can’t believe her phone is talking back to her.
Dong Young gets a call from Gong Myung and he leaves the library. Dong Gong can’t come out but Gong Myung complains about having a fight with his mother and left his home. Nong Young mentions that tells him that he needs to take into consideration his situation. He’s struggling to pass the exam while his family struggles to support him. He hangs up and goes back to studying.
Gong Myung can’t believe that Dong Young won’t come out. He debates calling again but Ki Bum tells him that Dong Young is really determined and is pretty sure that he will pass this time. Gong Myung asks Ki Bum if he has given up and Ki Bum blames him for calling him out when he was going to study. Gong Myung tells Ki Bum that he doesn’t have the resolve to study because his parents pay for everything that’s why Dong Young’s desperate resolve is a good thing. Suddenly, Ki Bum thinks of something and drags him off.
A student information about the school and is suggested to the joint class. Jin Yi and Ha Na overhears this recommendation and Jin Yi is jealous of the teachers in the joint class. Ha Na asks why and Jin Yi tells her that lesser known students start flocking to the teachers in the same joint class as the well-known teacher. Hae Won mentions that it’s not something to be jealous of.
Back in the office, they’re told that they will be making a group lecture with Jung Suk. Jin Yi is so happy about the opportunity but Ha Na isn’t so much. They are sent to the conference room to wait for Jung Suk.
Ki Bum wants to deplete his allowance so that he’s as desperate as Dong Young. He explains that you can tell how long someone has been at Noryangjin and shows it off.
Jung Suk tells Won Hae he refuses to do a joint class with these professors. Though it may be in his contract he doesn’t want other teachers who will cling onto his success. Jung Suk tells Won Hae that he’ll do a joint class with teachers that he approves of.
Jin Woong, Jin Yi and Ha Na are outside complaining about Jung Suk. Ha Na stays quiet while the other two complain and Jin Yi asks if she’s not mad. Ha Na tells her that she’s new so she can see what he’s saying. Jin Yi tells her that joint classes are to help the lesser known teachers up as a noble sacrifice. Ji Woong wants to get back at him but can only come up with a stupid idea. When he suggests that bad comments, Jin Yi mentions that he could back trace the ip address. Jin Yi suddenly gets a thought how it’s odd that he’s not doing it for the people who claims he forged his background. Jin Yi remembers that Ha Na has a cousin who graduated from Seoul University.
Another post pops up about his academic past and Jung Suk deletes it.
Ha Na logs in and doesn’t a search. Everyone is shocked to find that there is no one by the name of Jin Jung Suk that graduated from Seoul University. Jin Yi wants to tell the director but Ha Na tries to stop them. They understand that she feels under pressure seeing as she’s new and they promise to take care of it.
Ha Na goes and sits in the stairwell and doesn’t know why people care so much about his background. She asks her phone if she’s a coward and the worst. The phone reads of definitions and Ha Na agrees that she is doing something shameless. She goes to back up the teachers.
Yin Ji and Ji Woon come in to talk with Won Hae and get told that Jung Suk has agreed to do a joint class with them. Jin Yi tells him that it’s not the problem at the current time. Won Hae asks if he’ll incorporate Ha Na but he refuses citing her schooling as the reason. She accuses him of lying about his school and shows them that there is no one by that name graduation from Seoul university. He takes the computer and types in his legal name Jin Sang and shows them his card. He explains that he changed it for his last boss because they were worried people were going to laugh at him. Ha Na apologises and Jung Suk mentions that it solidifies them never working together. Jin Yi and Jin Woong claim to have not known and throws Ha Na under the bus.
Ki Bum and Gong Myung going to eat and Ki Bum suggests getting Dong Young to come out since he needs to eat. Dong Young refuses stating that he’s seeing Joo Yeon that weekend and needs to study. Ki Bum is surprised at his determination. Gong Myung tells him that with someone like Joo Yeon who took such good care of Dong Young it’s only right that he wants to get out to make her happy. Ki Bum tells him that maybe the reason that he don’t want to study because he has no one to be pleased if he passes. Gong Myung just thinks he’s nuts. Gong Myung has to apologise for Ki Bum.
Dong Young gets a message to go out and meet Joo Yeon. He goes to meet and they have soup. She tells him to slow down and he apologises wanting to get back to studying. She asks if he doesn’t remember what day it was, she tells him that it’s their 5th anniversary and he apologises. He does agree to stay with her longer.
Jung Suk suggests going by his legal name with the students since he doesn’t like rumours going around. Won Hae tells him that Jung Suk has become a brand name and he can’t change that because it would confuse the students and he’s worried he’ll lose his students. Jung Suk tells him that there could be some transitional pains and Won Hae explodes at him. Ji Woong makes light of the situation with Jin Yi when Won Hae comes out and yells at him. When Ha Na comes in she gets yelled at too and she apologises.
When Jung Suk comes leaves Ha Na runs after him and apologises about what happened. He tells her that it’s fine and she offers to have a drink with him. He asks if it’s so she can do the same sales pitch that she gave her student. He tells her that she should change careers and tells her to stop kissing up to save her own ass.
When Ha Na returns to the office Jin Yi and Jin Woong both apologises for throwing her under the bus and take her out to drink.
Dong Young and Joo Yeon spend some time relaxing together and reminisce. Joo Yeon goes to the bathroom telling him she’ll be right back. Before they go their separate ways Joo Yeon hands him a new shirt. She knows that he doesn’t have any fall clothes. He apologises for always accepting gifts. She tells him to go in and when he does she looks back sadly at him.
Ha Na is with Jin Yi and Jin Woong. She tells them that they should be happy and celebrating. Jin Yi tells her that they are there to make her happy and Ji Woong agrees. Ha Na excuses herself to go to the bathroom and Ji Woong and Jin Yi have a celebratory drink.
Ha Na notices that Kung Sul didn’t look at her message and write him a second one. Jung Suk is out drinking and enjoying his food when he sees her message. He acknowledges that she’s not smart but uses her brain to get far in other ways.
We get to see his past where even though he’s the one putting in all the work, his colleague just kisses up to their professor and got further than him. He accuses him of plagiarising his thesis. He refutes and said he only quoted it. Jung Sung mentions that he never quoted his work and tells him that it’s not alright. His senior tells him that he got the position thanks to him and will never forget that. Jung Sung refuses to accept help from someone like him.
While Ha Na is worried about Jung Suk not reading her texts, Ji Woong and Jin Yi are having a good time. When she comes back Ji Woong has to leave because of his curfew and Jin Yi gets a booty call.
Dong Youn is studying when he gets tired. He looks at the shirt that Joo Yeon gave him and pushes himself to continue studying. He gets a text from Joo Yeon telling him that she feels like they should call it quits. He send her back a message apologising for making her tell someone like him sorry. He thinks back to the message he saw on her phone about the breakup. He apologises for not letting her go sooner. Joo Yeon starts to cry on the train platform. Dong Young goes to a restaurant he frequents and gets given a plate of pork. Heès told that Joo Yeon came buy and bought it before. He breaks down crying at the table.
We see Ha Na having a beer and her voiceover tells us that she drinks alone because no one can comfort her after a bad day.
She gets to the bus stop and falls asleep. Gong Myung notices and wakes her. She nearly misses her bus but manages to get on. He notices her shoes and manages to toss one of them to her but misses the other. Ki Bum comes out and asks him what that was about. Gong Myung tells him that it was the girl who works at the sushi place. Ki Bum asks what he’s talking about because Ha Na is a Korean teacher at his school. Gong Myung mother call and tells him something he’s not happy about.
Jung Suk wonders who is coming to his house at that hour. He sees his mother and she asks him for a favour. She asks him to let his brother stay with him until he passes his exams. Gong Myung gets pulls into the apartment.