Ian Cowan transmigrates into a live-in son-in-law in a wealthy family,suffering his wife's infidelity and his in-laws' humiliation. At his lowest point, the "Wife-Spoiling System" awakens. However, Ian quickly discovers a system bug—married women other than his wife also qualify! He begins lavishly spending on every married woman except his cheating spouse. His mother-in-law, his rival's wife, businesswomen tycoons, underworld lady bosses, they all become targets of his "affection". The scorned son-in-law achieves an overnight reversal, tearing apart his unfaithful wife, crushing his enemies, and building his own commercial and social empire in the city.
