Sheng Nuannuan has suffered from congenital heart disease since childhood and dies at twenty-four due to organ rejection following a heart transplant. By the Bridge of Helplessness, Meng Po reveals the secrets of three lifetimes: Leng Sihan has loved her silently across all three, giving her his own heart in each of the first two lives in exchange for a few more years of happiness in the mortal world. Reborn with her memories intact, she returns to the healthy age of twenty and transfers to a school in the imperial capital, where she meets Leng Sihan for the first time through his grandfather's introduction. Deeply insecure, Leng Sihan can only care for her from afar, but Sheng Nuannuan takes the initiative to approach him, easing the loneliness in his heart and beginning a long love story in which they heal each other.