can someone help me what title is it...

The MC time-traveled and went back to his past when he didn’t have powers yet. When he received his power again, he went to the center to get tested and join what is basically a military training group. The highest-ranking person there, who is a prince, took interest in him and announced that the MC should become his assistant. But since the MC already experienced the future, he knows what will happen — including the fact that he will eventually kill the prince because of the his greed, it's adapted from the novel and it's slow burn I marinated it for too long now I don't even know the title