If i think about it again, mc should consider explaining the misunderstanding to the old man, by say to old man that he got skill to go back in time and steal power and to prove that mc got that power is by predict future event and explaining in detail who is mc ghost in a way only sword emperor can vouch whether mc is say truth or not. Then mc now can start explaining why he had 4000 times and so on.If the old man still not buying on mc explaination, fuck you old man.if that still doesnt make old man trust you then nothing will make him trust you.