I forgot the title of this novel but i remember that in one of the arcs the mc is transmigrated in an apocalypse world as a teacher with light powers, and a holy father personality, with these powers he creates a barrier to protects his students, i think. The ml is someone with powers and he and the mc end up together but the ml is trying to blacken him because he thinks the mc's personality is going to get him killed in a world like this. They kinda break up because of their different views and morals, and i say kinda because the ml is like you should take responsibility and stay with the mc and act like nothing has changed in fact they know more about each other, the mc is like how come we are even more intimate than when we were dating The arc ends up with mc sacrificing himself to become the new sun(?) so that the ml could live.