After I Transmigrated, I Became the Villainous Master of the Male Lead

A glitch in the game System sends Rong Yan into the game as the protagonist’s villainous master. To save her own life, she abandons her former aloof persona and becomes a gentle, loving mentor. As a proper master to the protagonist, she has to heal his wounds, care for him, and help him find a happy match with the heroines.

But why has the plot gone so wildly off course? Why has the protagonist, who was originally ruthless and cold, become an innocent little darling who loves to act cute?