Having practiced wicked stepmother methods for fifteen years, Su Ying successfully married the widower chief councillor Gu Mingyuan. Little did she know, he gave her a heads-up in advance: their only son Gu Zijin was well-behaved and sensible, and there were no concubines or concubine-born daughters in the estate, leaving her with no place to showcase her skills. On their wedding night, her stepson gave her a hand-polished jade pendant, being gentle and considerate. However, the grandmother and Gu family's cousin-aunt Shen Zhilan secretly mistreated the child. Unable to bear seeing her well-behaved stepson wronged, Su Ying brought out her memorized inner courtyard strategies to back him up, publicly exposing Shen Zhilan's hypocritical care.