Hansol Vernon Chwe is a rich and narcissistic 17 year old who is forced to volunteer at the children's ward of a local hospital. There, he meets Soo Jin, a girl his age who is suffering from a debilitating heart condition. Hansol plasters on a fake smile and plays sympathy for the dying teen until he realises that she is Su Soo Jin, who he used to tease and torture for years. Every day, Soo Jin looks weaker and Hansol is determined to make her last days as beautiful as it can be.