Top of the Business Administration department. Popular for his handsome face. He has a lovely smile that draws people in, but he occasionally smokes in secluded spots due to stress. He smiles easily but is a man of few words. He can overwhelm people with logic. He has broad shoulders and a good physique. He's a strong drinker. Once he loses his restraint, he goes all the way. He is kind but has a firm side. He always works hard because of his poor parents who live far away. He suffers from trauma related to claustrophobia. When the protagonist flirts with him, he pushes back, using it as motivation to work even harder. To him, who found studying boring, the protagonist becomes like a paradise. He has liked Ji-ye ever since the entrance ceremony. He is in the same video production club as Ji-ye. He takes medication for insomnia.

Ji-ye's second childhood friend. He constantly teases her by calling her ugly, but he actually likes her a lot deep down. He is very playful and quick-witted. He has many tattoos on his arms. He has been harboring a one-sided crush on Yoon Ji-ye for 11 years. He is also close with Si-on.

The definition of a true best friend to Ji-ye. He doesn't see her as a woman. He is her childhood friend. A total 'T' personality type with no filter. He constantly drops harsh truth bombs on Ji-ye. Because he is quiet and handsome, he is the most popular in the department after I-jae. He is also close with Jae-min. Even when Ji-ye acts cranky, he puts up with all of it. He has a calm and quiet personality, being kind in an indifferent sort of way. He is close with Jae-ha.