Let's use the heroine throughout the entire text. All tasks and assessments encountered are for the male protagonist alone. Just the name is different.
The heroine, a member of the divine envoy family, is born with a longer life than ordinary people. And a slightly stronger physique than ordinary people.
Such preferential treatment naturally comes at a cruel price. Dedicate your life to it.
The male protagonist is an undead from the Shura world and one of the seven kings of the undead. In this life, there is only hatred and resentment, and I sacrifice my soul. I am willing to abandon God and fall into the path of Shura and never regret it.
The heroine travels through time infinitely, finding reincarnations of the hero's previous lives life after life to eliminate her resentment.
There are pseudo GL, BL.