Taehyung, he is a new young lecturer at Yonsei University who is loved by many female students because of his good looks, wisdom and insight. However, behind his good side that everyone knows, he has a dark side, that is an obsession with one of the girls on the same university, the girl who was the reason he applied to become a lecturer there. And in this new semester he got the job to teach 2 courses, that is history and archaeological phylo in the class where the girl is.

Famous, humble, but obsessive

Wonwoo is a young CEO of a well-known and influential company. He is known as cold-hearted, rude, and arrogant. He is ambitious, smart and intelligent, but that also makes him stubborn and only believes in his own thoughts. His parents divorced when he was kid because his mother preferred another man so she had the heart to leave him and his father. Because of this, he continues to be single and hates women, especially beautiful women. 

Arrogant, rude, cold, and rich CEO

Seungcheol, a well-known young businessman, has a child named Choi Hyera. Hyera is not his biological child but the child of his brother and sister-in-law who died but Seungcheol kept this a secret from Hyera and everyone except his family. He doesn't want to know love or even have a lover because he only wants to focus on taking care of Hyera. But all that changed when Hyera kept mentioning the name of her kindergarten teacher who she said was kind and whom she really liked.

Sweet, clingy, and mature

he's a such playful person, funny, humorous person, and likes to make jokes. he's kind and very gentle. he's also a good listener and adviser. he's Muslim and obedient to Allah. he also understands the teachings of Islam

He's good friends with Babeh, Hannie, Joshua, Jun, Hoshi, Wonwoo, Uji, Hao, Mingyu, Kwan, Bonon and Dino.