NAMJAILJJANG KIM JI-AN

A new student named Kim Ji-An, a loner, transfers to Sujeong High School. But he's actually a total nerd. And he's a girl..!! Ji-An's parents are worried about her being a troublemaker who's been dated by a guy in the past, so they only want to send her to an all-girls high school, but Ji-An wants to go to an engineering school. In the end, she goes to an engineering school on the condition that she dresses as a boy and has a quiet school life. It's already noisy!! -_-^

(Source: Naver, translated)