An eighth-realm physical-body powerhouse male protagonist is tricked by his master with a piece of engagement paper into becoming a matrilocal son-in-law. Lacking spiritual power and a dantian, he is looked down upon and mocked by everyone, forced to replace the engagement and marry the eldest miss who suffers from cold poison and has not much time left to live. Facing provocation from cultivators and harassment from servants, the male protagonist uses his invincible physical body to smash flying swords and suppress wicked servants. To save the female protagonist, he rushes to the perilous Hundred Beasts Valley to hunt demonic beasts in exchange for medicinal funds, protecting his gentle wife on one hand while sweeping away all opponents who look down on him on the other hand.