"This isn't the life that I wanted." On the day of her wedding, Eunha, who has hidden the fact that she's a lesbian her entire life, decides to jump off a building and end her life, not wanting to devote her life to a person she can't love. Just as she leaps, she closes her eyes and wistfully reminiscences her first love whom she never told her feelings for... only to find herself 10 years back in high school when she opens her eyes. As she is reunited with her first love, will Eunha be able to turn back her ill-fated life?