three years ago, liu minyu (song seung-heon) accidentally lost his beloved fiancée. he chose to study abroad with a sad heart. at that time, shen huiyuan (sun ye-jin) was a quiet girl with congenital heart disease. she watched others jump healthy and could only sit in the corner. eee。 three years later, huiyuan, who had previously undergone a heart transplant, became lively and cheerful and had a beloved boyfriend. at the airport, huiyuan passed by minyu, who had returned from abroad, and felt the rapid beating of her heart. after returning to china, minyu went to the mountain she had climbed with her fiancée and met the lost huiyuan. the two were trapped on the mountain and had a communication. huiyuan felt the rapid beating of her heart again, and minyu saw the shadow of her deceased fiancée in huiyuan. in order to thank the family who donated their hearts to her, huiyuan searched for clues to travel, and at the destination she met minyu, who visited her fiancée's family, and it turned out that the two were contacted like this...