Kim Hye-jin (Hwang Jung-eum)'s father runs a publishing house and his business is very prosperous. However, an accident caused the publishing house to go bankrupt, and Kim Hye-jin's family's status plummeted. The former daughter of a rich family also became a rag girl who relied on odd jobs to supplement the family income. One day, Kim Hye-jin's first love Ji Shengjun (Park Seo-joon) returned from abroad and asked Kim Hye-jin to meet up and renew their previous relationship. Kim Hye-jin, who was inferior, asked her friend Min Ha-ri (Go Jun-hee) to go on the date for her. At the same time, Kim Hye-jin got an internship job that was very valuable to her. However, what Kim Hye-jin did not expect was that her boss turned out to be Ji Shengjun, who did not recognize Kim Hye-jin and was very cold to her. Min Ha-ri really fell in love with the young and handsome Ji Shengjun, and a triangle relationship became extremely complicated due to the misplaced identity.