At Himlech High, Sangwon quietly obsesses over his friend Junil, keeping thousands of secret photos locked behind a password only he knows-0603. Anxin, the strict yet friendly school president, discovers the file and can't help but be intrigued. What starts as curiosity quickly turns into a dangerous game of secrets, teasing, and silent intimidation. In a school where everyone seems to know each other, only Sangwon and Anxin share the tension-and the thrill-of a connection no one else can see.