Is cellular (body) memory possible? Can a transplant recipient take on mannerisms and memories of the donor through the act of tissue transfer? Lee Bom-yi (Sooyoung) is a heart transplant recipient. She is engaged to marry the handsome, successful doctor Kang Dong-Wook (Lee Joon-Hyuk). A chance encounter with Kang Dong-ha (Kam Woo-Sung) makes Bom-yi feel like something is missing. And why does she find so much happiness in spending time with Dong-ha's children?