False Affection: My Mysterious Mr. Moo

Novel Summary
Mu Nuannuan’s elder half sister refuses to marry her fiancé, whom people say is ugly and crippled, so her mother kneels before her, begging, “Your elder sister deserves better. Help her, please!” Fed up, she takes her sister’s place and marries him. On the night of their wedding, the handsome man frowns when he looks at her. “So ugly.”
– Description from Novelupdates