DAY7

One day, Kim Yeondoo, an ordinary high school girl, is suddenly terrorized by her former friend from middle school and stalker in KakaoTalk. In order to stop this, she changes her profile picture to a picture of a random guy and posts him as her boyfriend. But, it turns out that the picture she used is the school's scariest bully, Ji Hyunho?! As it turns out, the bullies are the tsundere, Ji Hyunho, the smart and cool class president, Seo Juho, and the young man living upstairs of her home, Kang Ahun. Not only that, there's also the My Way baseball boy, Choi Seunghyun, and the pure and lively, Jung Jisung. How did she end up getting entangled with the handsome bullies?

On his first day working as a new teacher at his alma mater, Sunny Day Boys High School, Lee Taesung is welcomed by the bright and sunny smile of Seo Sunny, a warmhearted chemistry teacher. Feeling immediately drawn to Sunny, who resembles his first love from high school, Taesung tries to hold back his feelings by keeping his distance. But still, Taesung can't help but be pulled in by Sunny's irresistible charm...