Three years previously Yoo Minwoo lost his first love in a tragic accident. As he struggles on with life, he meets Shim Hyewon who reminds him of his lost love but is racked with emotion and confusion as his feelings for these two women become intertwined. Unbeknownst to the florist Hyewon, she has received her heart transplant and a second chance at life from Minwoo's first love. When the two cross paths, Hyewon notices her unusual heartbeat. Nobody knew it was her heart that remembered and beats strong for her lost love Minwoo. As Hyewon starts falling in love with Minwoo, soon the conflict erupts between the lovely florist and her fiancé Park Jeongjae.