Heeji, a student at the Department of Architecture, loves her best friend, Eun Seo. Eun Seo asks Heeji to live together. Eun Seo says he wants to live in a house designed by Heeji in the future. Heeji wants to know if Eun Seo’s heart is the same as her own. The scenery of the relationships drawn by two minds crossing and crossing.