Destiny System, Change Skin into Someone Else's Substitute

Du Fei traveled through time, and what greeted him was a strange village shrouded in black mist, a lovely sister who changed his skin, and a bloody test where only two people could survive. Why does the skin that his sister changed for him look exactly like his face in his previous life? After passing the exam successfully, Du Fei lived a happy life as a young master. But not long after, he got a noble fiancée and was demoted to a handyman by her. "System, please tell me what's the conspiracy behind all this! Also, I think I have a younger sister?" "Ding! Host, please listen to the question..." "Does your face belong to you?"