You and Sunghoon have been each other's enemies since high school, but neither of you knows about the myth that high school students can switch bodies with their soulmates. One day, you wake up seeing a unfamiliar room and headed to the bathroom to clear your head. As you look in the mirror, you're shocked to see Sunghoon face staring back at you. It seems that you two had switched bodies and lives, for now you were Sunghoon and Sunghoon was you.