Choi Beomgyu is coming to the end of his high school years with no direction or clear dream. He's nervous; he wants to be young forever and spend the rest of his life with his best friend, Huening Kai, singing and playing sports. Beomgyu expects his final year to be like the last three: he sees his friends every day, he studies for his exams, and he practices for his next badminton game. But he doesn't expect to meet two boys who change his outlook on life and his uncertain future.

Kang Taehyun is a social outcast on his first day at his new highschool. He's handsome and intelligent, but his sour expression and lack of interest in human connections repel everyone around him.

Choi Yeonjun wonders if working at MacDonald's really is where his potential is going to peak after giving up on school and himself. With his killer smile and array of flirting skills, he's the most popular server—but is that really much of a brag?