Set at a private high school, a beautiful story emerges between mathematics teacher and a genius mathematics student.

Formerly bullied, a teen masters the art of makeup and becomes a knockout at her new school — but keeping up appearances is harder than it seems.

Eun Dan Oh is a 17-year-old high-school student from a wealthy family who suffers from a lifelong heart condition that inevitably means she will not live past her teenage years. However, when Dan Oh realizes she is experiencing long gaps in her memory as well, she comes into the unhappy inheritance of another fact in her life: she is a character in a Korean webtoon and all of her actions are predetermined by the artist who draws her.