Seoyoung and hyunseok have been dating for years. Their relationship healthy full of love and romantic and full of sex and steamy days in bed. Until one day Seoyoungs younger sister Yoora comes into play Trying to threaten the foundation they’ve spent so long building. One drunken night hyunseok has drunk sex with Yoora in a hotel and seoyoung walks in on them. Yoora has always been jealous of Seoyoung because she had the better life being adopted by the Han family. So many new and old characters come to play and it’s a life of drama heartbreak and love.