Jack Lu is born with a deadly blood poison and must find a woman with a butterfly birthmark to survive. After a frustrating search, he meets Wendy Qin, who rejects his money but is forced to comply when he helps her mother’s illness. They marry under pressure, but their relationship grows complicated as they face school bullying, family conflicts, and life-threatening challenges. Wendy Qin’s pregnancy risks her life, and Jack Lu struggles between love and sacrifice. After years of separation, they reunite through danger, misunderstandings, and fierce devotion.