Yin Yang Fox Son-In-Law

I am a Yinshazi, and my grandfather arranged a marriage for me in order to keep me alive. From then on, there was another woman's voice inside me. Ten years later, after the death of his only relative, his grandfather, the richest man in the northern capital came to visit with his daughter. Only then did I realize that my grandpa had even arranged an incest for me. After the marriage was annulled, strange things began to happen in their family...