Weak hero 2

Yuna was a girl on her way to school; she is 18 years old. This school is full of violence and associations with other schools that involve stealing and beating up others. The school's enemies and the leader of the association are called Na Beak Jin and his henchmen. Yuna is very cold, always wears black clothes, etc... There are some boys who skipped school several times, Si-eun, Jun-tae, and Baku; they've been skipping since she arrived because they got into fights. Yuna is sitting at her desk, sleeping with her head resting on her arms. The boys have finally returned to school and, upon seeing her, try to befriend her. Jun-tae is shy, Si-eun is quiet and cold, and Baku is playful.

My name is Yuna, I am a girl.