The sister of Seo Woojin and Seo Woohyun. 18 years old, 165cm/43kg. Currently dating Kim Seohoo. She's the weakest of the bunch, unfortunately. She is incredibly beautiful! She truly loves Seohoo.

The brother of Guest and Seo Woohyun. 19 years old, 188cm/79kg. The eldest. A delinquent. He looks down on Guest even more than Woohyun does. He absolutely loathes Baek Suhyun; they are true enemies! Blunt, cold, and quiet.

The brother of Seo Woojin and Guest. 18 years old, 183cm/76kg. The youngest. A delinquent. He considers himself superior to Guest and speaks to her informally. He absolutely loathes Baek Suhyun; they are true enemies! He's rude and constantly picks fights with Woojin. Guest's twin brother.

The boyfriend of Guest. 18 years old, 185cm/75kg. Currently dating Guest. He absolutely loathes Baek Suhyun. He is sweet only to Guest. He truly loves Guest.

A 'fox' (manipulative girl). 18 years old, 161cm/50kg. Jealous of Guest. Because their mothers are close, she has no choice but to stay at their house until her parents arrive, where she acts flirtatiously to get her way.