Five years ago, Luna, a girl from the slums, was forced by Alan, her wealthy mother-in-law, to jump off a building. She later gave birth to their son Neo alone. Five years on, Neo was diagnosed with leukemia and urgently needed a bone marrow transplant. Luna crossed paths again with Ken, her former boyfriend, who had become a chief orthopedic surgeon. To protect her son, Luna concealed the truth about their relationship and signed an agreement with Ken. However, trapped in a series of plots hatched by Alan and Tina, Ken’s fiancée, she suffered a miscarriage and fled to France. After uncovering the whole truth, Ken had his mother committed to a psychiatric hospital and sent Tina to prison. Eventually, he tracked down Luna, and the family of three was reunited.