Save My Fiancée, the Eldest Daughter of a Wealthy Family

I inexplicably traveled to the body of Ye Ning, the adopted son of the Kamiya family, one of the four major families in the Xia Kingdom. This adopted son was poisoned and killed. The reason was that the patriarch wanted to marry his eldest daughter to him on her eighteenth birthday and give him half of the family property. However, there are many snobs in the family. If I accept, my life may not be guaranteed, and there are only 46 days until the eldest daughter's birthday. What should I do? Fortunately, I traveled through time with the system destiny card, so I'll just have fun. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.