Five years ago, Aerara of the Wayne family spent one night with Lucian, the Dragon Clan leader, and gave birth to a daughter — but her rival Lydia bribed a doctor to claim the baby died. Five years later, Aerara rescues Luna, a girl fleeing kidnappers, who turns out to be Lucian's daughter. Luna insists on matchmaking them into marriage. To save the dragon king, whose mating heat has come early, and to fund her lab, Aerara accepts a contract marriage. Lydia's poisonings and hired killers are exposed and defeated one by one. A paternity test reveals the truth: Luna is Aerara's biological daughter — and the three of them are finally a family.