Son Seungwan and Bae Joohyun has been together since their teenage year. Until one day, a plane crash separate them. Joohyun lose her Seungwan. Five years later, Joohyun is engage to Kang Seulgi, but deep in her heart she never forget about Seungwan. A month before her marriage, she met Wendy Kang, Seulgi's cousin from Canada. Meeting him never be a problem for Joohyun until she saw Seungwan in Wendy.