A mortal that goes to hunt immortals. It could be interesting, since his “truth” only activates when he is at a point of dying/almost dying, if I understood it right. And since he must start every time from the beginning, he can't really abuse this ability. So it could be either peak or garbage. Depends on how the author is going with this story.
Personally, I would have seen his first and second lives completely and not started from his third life. Yeah, maybe that is appealing, but since he didn't get any cheat powers, I really would have liked to see his struggles in that world. How he went from nothing at his start to being an emperor of a city. Only with his experience from his first life in that world as an anchor for what is going to possibly happen, where he didn't have any involvement.
What also intrigues me is if his wife from his first life is the same in the second or if he found another. Are we going to see them in his third life, and will he collect them all, since he literally shared a whole life with them? It would be nice when they have kind of a memory of their fulfilling life with him and maybe search for him themselves.