Wild animal park zookeeper Shen Shulan accidentally saves Mu family young master Mu Yuan, and is hired with a high salary by Mu Zhenting to be the step-mom of three rebellious young masters. Faced with the three brothers of different personalities and hard to discipline, Shen Shulan has her own set of disciplinary methods, setting family rules to constrain everyone. She exposes the emotional scam of Su Nian and her mother deceiving Mu Yuan, also guides Mu Cheng's distorted and paranoid psychological trauma, resolving the pain left by the original family. After the conspiracy is exposed, Su Nian and her mother accept legal sanctions, and Mu Cheng actively accepts psychological intervention. The three brothers sincerely accept Shen Shulan, Mu Zhenting hands over family property at the wedding, and the family reaps a complete fulfillment.