Valentina Leigh Veilleux, never knew my mom has a secret identity hidden in her flaws for this past 16 years of life. And I'm here to construct, observe, and analyze her death. And I'm gonna search for the person hidden in her locket. - Leigh

Kim Dahyun, a nerd girl who forced to stay with her aunt, Park Min Ji and continue her high school at Dream Art High School with her cousin, Park Jimin who hates her. Everybody at the school hates her because she is nerd and being close to Jimin (he is a popular bad guy) at the school. Seulgi is jealous of them. She bullied Dahyun. Dahyun change herself. From nerd to popular. What happened next?