Lynn Jiang transmigrates into a novel as the vicious brother-in-law. The original owner was a compulsive gambler who committed domestic violence, leading to the tragic fates of his five sister-in-laws. He is confronted by Yvonne Li seeking revenge. Lynn Jiang defuses the crisis and rewrites their fates. Using his Engineering PhD expertise, he guides Lara Li to improve inventions, melts his sister-in-laws' trauma, and leads them to build careers. He builds a warm home for his five sister-in-laws.