Xiao Chen, an ordinary young man with a capable and decisive personality, was designed by Lin Bei, his brother who grew up together, and was forced to marry into the mysterious aristocratic Su family for Lin Bei. The eldest daughter of the Su family, Su Muxue, is frail and sick, and is rumored to not live more than three years. The real purpose of Xiao Chen's marriage is to become a "sacrifice" for the Su family's forbidden secret method. On his wedding night, Xiao Chen discovered that a mysterious system had awakened in his body - the "Lonely Walker". Whenever he experienced a betrayal or a lonely choice, the system would give him new abilities. In the Su family, a family with a bright surface but surging undercurrents, Xiao Chen not only has to face the schemes of his father-in-law and mother-in-law, and the hostility of his sister-in-law, but he also has to be wary of his former friend Lin Bei's pressing steps in the dark. He resolves the crisis step by step, transforming from a substitute bride into the master of destiny, only to discover that behind all this, there is a shocking conspiracy that spans a century.
