Hot Young Bloods (2014)

Set in the early 1980's in Heongseong, South Korea. Young Sook is the feared leader of a female gang at the high school. Although she is known for her toughness, she has a secret crush on Joong Gil. Meanwhile, Joong Gil is the school's playboy. He attempts to woo all the girls at his high school except for Young Sook. That's because Gwang Shik, the feared leader of a rival school's male gang, views Young Sook as his woman.

A new female transfer student from Seoul arrives at their high school. She's different from the other girls and beautiful. Joong Gil falls for her instantly, while Young Sook attempts to prevent the new girl from encroaching on her secret crush. Trouble also brews for Joong Gil as Gwang Shik becomes aware of Young Sook stepping in between Joong Gil and the new transfer student.