Feng Zuoren, a skilled assassin, disguises herself as a beautiful stepmother to infiltrate a noble family and eliminate the former crown prince. However, her mission becomes complicated when she develops a tense and unexpected bond with her clever stepson, uncovering secrets that challenge everything she thought she knew.

Determined university student Lu Ran escapes an arranged marriage to an abusive man, only to unexpectedly meet a kind, tall, and handsome stranger—who turns out to be her intended fiancé.