Without realizing, Woo Soo Jin, first year going to high school, accidently transferred to a used-to-be all-boys high school.

They recently made it co-ed this year and now she is the only other girl in her classroom with the ratio of 1 to 12. One guy,

Kim Jong Hyun is giving her a hard time adjusting to the new school life. But one day he finds out something about her

actually being there. Will she be able to stop him from revealing her secret to the whole school or will he reveal her secret

before she has the time to stop him?