To investigate her sister's missing after marrying into the Shen family, Su Yunqing infiltrates Shen’s household disguised as a maid, only to be trapped in deadly inner-court schemes. Each breakthrough in her investigation triggers a forced soul-transmigration into the body of a villain, hurling her into mortal peril. Amidst the ups and downs, Su Yunqing develops feelings for Shen Xingyan, Shen family's heir. These bizarre transmigrations gradually help her unveil the truth — exposing generations of blood feuds and a conspiracy that shatters both families. How will she fight to survive while safeguarding the forbidden love?