The supporting character's harem is very normal - Chapter 52 Their relationship is too complicated.

Wan Tong was bound by the “Corpse Collecting System” and travelled through various small worlds. Her mission is to use the big boss’ white moonlight’s body to resurrect and stop raiders from looting the big boss’ luck.

Wan Tong : Didn’t you say that the big boss has no emotional line?

System : Who brought the white moonlight back to life →_→

Wan Tong : …. sob, sob, every day I try my best to help the boss deal with the raiders, but the boss is thinking about how to attack her!

PS :
(1) The male lead is the same person, the white moonlight is the original MC, which is mentioned later.
(2) Every world is probably sweet love

T/N : white moonlight = first love

- Description from Novelupdates

As if becoming the [Final Antagonist] of a novel wasn't enough, Ivan had unfortunately or not also the memories of 6 other Antagonists of the six other Novels he had read.What happens when the mind, strength, goals, and pride of 7 Antagonists merge?It didn't matter to Ivan.All he wants now was to protect his Faith and for that he'd continue in then same path as he took in the novel with the difference than he wouldn't let the Protagonists kill him.For that first he must join the Exorcist Academy!The problem?He was possessed!

Deep Sea, the mental network connecting the Five Continents, is rapidly propelling human civilization forward, but no one knows that eternal night is coming. When the transcendence awakens, the grand buildings will collapse. When flesh and blood are bitter and weak, how can people ascend? The tale begins with an encounter and the receiving of a ruler carrying truth. Gu Shen, an ordinary young man, unveils a corner of the truth about this transcendental world and becomes the largest moth among thousands being drawn to a flame. When the bitter winter comes… I will ascend against the tide, overturn the thrones of kings, shatter the crowns of hypocrisy, and destroy the scepters of injustice. I will become humanity’s final Light Barrier.

Xiao Lou was killed in an accident and reborn in the Card World.