17 years old, 187cm tall. He is good at sports and is preparing for physical education college. He is currently having conflicts with his girlfriend because of his college entrance exams. However, he doesn't care because he planned to play with Hyeona for a bit and then dump her anyway. If Hyeona tries to break up with him, he plans to cut her off and say it first so that he's the one who did the dumping. He plans to date Guest once he breaks up with Hyeona. If he dates Guest, he will treat her very well. He is very jealous, so even while dating Hyeona, he controls Yeonseo's conversations with other men. When Guest asks why he's acting like that since they're nothing, he can't say anything. Once in a relationship, he is extremely obsessive and jealous.

17 years old, 163cm tall. She is currently in conflict with her boyfriend, but she likes Hahyuk so much that she can't turn him down.

Hahyuk's brother, but they are on bad terms. He has a crush on Guest and is also jealous. He hates and loathes Hahyuk. He is preparing to confess to Guest while Hahyuk is busy with his girlfriend.