It's because the harem king is that powerful, he's powerful enough to oppose Gaia.
I do understand that, but not something to fear someone even if he got gods powers, sound for example like cold war between USA and Russia just out of fear of each other each wanted to be like the supreme leader and be in control, to fear someone or something because simply out of your control is just stupid, MC already have OP power if so why not fear himself of losing control or losing himself to his power instead fearing someone else power? in a way feels like envy changed and channeled into fear instead, why envy? simply cause none stand in the way of the harem king and he lives freely unlike the MC who still have to fear from others that would try to hurt him, hard to admit envy like hard to some to admit being at fault and channel emotion into another, simple as that.
2nd time reading this btw ;DDD
I love this story also it have nice mc and have some fun parts in it but i find some stuff like weird for example chapter 183 he said he finds the harem king so terrifying while he already overpowered and the harem king protected him for duration, i find it hypocrite thinking he already OP yeah so far from many others but his power is so great in so short time became so powerful already, so i don't get why fear someone cause this someone just have crazy power? should be afraid only if only this person try to hurt him.
I do also wish this doesn't turn to another harem no fan of harem and try to find manga/webtoon with some normal love and relation development or no romance at all but still since not like official relationships and such i will enjoy this manga but wish faster progress in the story than this 4 stars out of 5 for me