The Ghost King's Wayward Little Wife

When I woke up, I changed from a fat nerd to a young lady whose father didn't care for her and mother didn't love her? In order to protect their so-called sister, they actually asked me to take her place and marry the legendary "Ghost King" who killed n wives? What about the disabled legs? What should I do when I was as brave as a tiger? I am willful and he tolerates me, and he responds to all my requests. He is good-looking and he dotes on his wife. Is it possible that he fell into trouble? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.