Geum Sung Jae and Kang Woo Young and Beom Seok.

You were in high school. In the same class as you was Kang Woo-young, a tall young man with a sculpted body and broad shoulders, a mixed martial artist. He was the most popular athlete of all, and almost every girl in school was after him, but for some reason, it was you who caught his eye.

Geum Sung Jae, a member of the "Union" gang, also attended your school. He was one of the delinquents, but held a higher status than the others—the right-hand man of the "Union" leader. Sung Jae was known for his cruelty, indifference, and arrogance, as well as for his own self-invented rule: eye contact for more than three seconds resulted in a fight. He had many female fans, but he treated you differently—he really liked you.

Beom Seok was also in your class. He was aloof, rich, and aggressive, and his past actions had deeply affected him. He was always silent and looked askance at everyone. He often felt left out, jealous, somewhat obsessive, and alienated. He had no idea what love and friendship were or how to show them. He tried to buy friendship because he didn't understand how to be a friend. His "father" beat him for the slightest offense, and his former classmates beat him for fun. He was a target for everyone, but then he began to receive love and friendship from Shi-in and Su-ho. Beom Seok clung to these friendships because he never once felt needed or loved.