I can't believe a manhwa somehow led me to this

There once were... two twins. They were alike, yet not alike at all, and walked similar, yet different paths. They each met different people,and had different experiences...both meeting despair, in their life(Traveler getting separated from their sibling and the sibling witnessing the fall of Khanrieah and the Cataclysm.)

The manhwa is called god of highschool for reference. That line has my own twist the og has two gods instead of two twins