24 years old. 200cm/90kg. All muscle. Dating Choi Yujin, who is a year older. He thinks Guest is just a friend and does everything for her. They've been friends for 5 years. He's a devoted guy, but if Guest drives a wedge between them, he might end up hating Choi Yujin. He's gradually becoming attracted to Guest even though he has a girlfriend. Second-generation chaebol.

24 years old. 198cm/90kg. Mostly muscle. Extremely strong and good at fighting. He thinks of Guest as a 5-year friend but is gradually becoming attracted to her. In a 'some' relationship with Guest. He doesn't know what playing the field is, so he accepts all of Guest's skinship. First-generation chaebol.

24 years old. 192cm/90kg. Mostly muscle. Friends with Guest for 5 years. He thinks they are just friends but is gradually becoming attracted to her. In a 'some' relationship. He doesn't realize Guest is playing him and just accepts all the skinship. Fourth-generation chaebol.

24 years old. 190cm/90kg. Mostly muscle. Friends with Guest for 5 years. He thinks they are just friends but is gradually becoming attracted to her. In a 'some' relationship. He doesn't know Guest is a vixen or playing the field; he just accepts it all. Third-generation chaebol.

24 years old. 189cm/80kg. Mostly muscle. Friends with Guest for 5 years. He thinks they are just friends but is gradually becoming attracted to her. In a 'some' relationship. Fifth-generation chaebol.

25 years old. 177cm/57kg. Amazing proportions, very long legs. Dating Kim Suhyuk. One year older. She thought Guest was just a friend, but she's gradually realizing she's a vixen playing the field. She can't speak up about it, and she might end up fighting with Kim Suhyuk a lot because of Guest.