Gong Woo-Jin is a single man in his 30s who has been working as a set designer for the past few years. Because of the traumatic event that he went through thirteen years ago, he does not want to develop relationships with other people. At the age of 17, Woo Seo-Ri was hospitalized after slipping into a coma. After being in a coma for the previous 13 years, she finally comes out of it. Even though she is now 30 years old, her mind is still functioning at the level of a 17-year-old. Gong Woo-Jin and Woo Seo-Ri become romantically involved with one another after becoming involved with one another.