On one side is the infatuated Duan Tianming who loves Jiang Nan who has congenital heart disease, but is rejected by her again and again. She loves him, but is afraid that she will not be able to accompany him for the rest of her life; on the other side, Leyan and Nursery Rhymes are happy enemies, and they are in chaos if they can't break up; four friends who have grown up since childhood, two teams of childhood sweethearts, what will their future life be like?