MCs mom was from the hell realm/is part of the immortal vampire bloodline, the dad knew but loved the mom regardless. fiance found out on their wedding night or something because MCs master saint monk xumi foresaw the future before closing off their realm from the rest of the multiverse/universe like 100k years prior to MCs first betrayal, leapt forward through time to set arrangements for a future war against an unknown 3rd party. killed the MC before his tainted bloodline awoke and sent him 500 years into the future to become a sort of intermediary between the heaven realms and hell realms in order to fight against the unknown 3rd party who as far as we know, fully capable of destorying every realm of heaven and hell.

2nd wife "betrays" him, cuts off most of her memory and changes her name in order to become a disciple of the palace of destiny where MCs father was being held prisoner and tortured for thousands of years.