One early morning, Tae Ju breaks up with a girl he has dated for three months and comes home to be ready for work. When he arrives at his apartment, his joyful mood is ruined. Eun Soo, who he has never seen before, is sleeping at the door. She comes for her sister, and doesn't believe he lives here. He thinks he managed to make her leave, but the doorbell rings while he is taking a shower. When he opens the door, Eun Soo runs into his apartment, enters the bathroom, and locks its door.

Tae Ju has to take care of Hye Rin, who is totally wasted. He can't leave her on the street and finds a motel while trying to figure out what to do with her. Eun Soo has several job interviews, but it is not easy to get a job. She hasn't heard from her mother, who is supposed to send her living expenses, and has no balance in her bank account. In the end, she starts part-time as a sales staff for promotions at the World Department Store to make money.

Hye Rin's mother calls Jun Hyuk to tell him to move out because she can't stand that he and her daughter are in the same house, which makes her uncomfortable. At the wedding of Mi Yeon, Tae Ju's ex-girlfriend, she gives him a hotel room key. Tae Ju gives the key to the groom, saying that the bride doesn't like the room and asking if she should change the groom too. The angry groom punches Tae Ju. Hye Rin, who is at the wedding as a guest of the groom, sees Tae Ju fighting with the groom.

When Tae Ju works for the event at the department store, he needs one more model for facial masks. He asks Eun Soo, who works at the department store, to be a model for his event. He notices her discomfort and takes her out from the stage. When he peels off the facial mask on her face, her face is swollen with rashes. Tae Ju wants to use Hye Rin's background as a wealthy family to promote her fashion show, but she refuses. He tells her to throw away her vanity or pride and do whatever it takes.

When Eun Soo is wasted, she reports Tae Ju for sexual harassment to the police. After being interrogated at the police station, Tae Ju goes to her and asks her why. When Tae Ju is aggressive, she wants to report him again for trespassing and attempted assault. He talks it out with her nicely, and she confesses she likes him. Tae Ju accepts Hye Rin's proposal to act as her boyfriend. Eun Soo asks Tae Ju to go out with her but hasn't heard from him since. She starts getting anxious about it.

Tae Ju starts to work at the World Department Store and runs into Eun Soo in the library at the company. He asks how she passed the official job interview. She is offended by his sarcastic manner and says not to look down on her anymore. Meanwhile, creditors rush into Eun Soo's apartment to look for Kyung Jin, her stepmother. Eun Soo starts to work at a saloon to pay her mother's debt and runs into Jun Hyuk, who comes to meet his friends.