Soon to be married, Sun-woo is haunted by the memories of Ji-hee, the girl from the flower shop. Three years ago, Sun-woo received a calla lily with a musical note attached to it every day. One day he meets the beatiful Ji-hee on the bus and connects her with the daily anonymous gift when he notices the same music from the musical note coming from the flower shop she works at. Sun-woo confesses his love for her and sets up a date for them to meet at a local hotel. At the hotel, though, he finds Ji-hee taken hostage and tragically murdered by the assailant. His desperate wish to revive her magically comes true whereby time is turned back to the day of the fateful date at the hotel. Seeking a chance to save her life, Sun-woo is given 24 hours to turn things around. Through this process Sun-woo realizes that it was Ji-hee's friend Su-jin and not Ji-hee who sent the calla lilies three years ago. With this, he is transported back to the present, to begin the quest for his true love, Su-jin.