
The students from a luxurious residential neighborhood, the apartment complexes where the middle class resides, and the underdeveloped residential street all go to the same school and learn in the same classroom. The new semester begins, and Da In, a naïve girl, transfers to school from the countryside. Although she's raised by a single mom, she's a very cheerful literary girl. Due to her pure mindedness, she's bullied by her classmates in the beginning, but Se Chan, a boy from a luxurious town, helps her. Se Chan used to be a bully, but he now hates bullying because of his painful memory. He is confused about whether he helped Da In because he liked her or just hated bullying. The story of how Da In survives in the school where the strata exists in her own cheerful way begins.

as Yoo Da-In

as Lee Se-Chan

as Kim Suk-Joo

as Jo Dal-Shik

as Lee Kang-san

as Ahn Young-Jin

as Bae Yi-Kyung

as Im Sung-Min

as Park Bok-Man

as Yang Hee-Jung

as Lee Jae-Min

as Jeon Kyung-Hee

as Cho Jae-Hyun

as Myung Gye-Nam

as Noh Il-Pyeong

as Yoon Yo-Ran