Neoui Messiah

Yohan is the son of the leader of a cult who calls himself the Messiah. His father, hoping his only son will succeed him, even gave him his own name — but Yohan despises him.

For Yohan’s birthday, his father presents him with a “poor little lamb,” a boy named Yun. Yohan’s feelings for Yun quickly grow into something far deeper than mere affection.
But the closer Yohan gets to him, the more he realizes that Yun cannot let go of the cult leader…

Original Webtoon