The male protagonist has no system and only relies on his own strength to act. He does not kill people at will. The male protagonist only kills the children of luck who have a system. The children of luck without a system are not worthy of the male protagonist at all.
No harem, single female protagonist, male protagonist is not invincible
The harem plot is all carried out by the lucky child and the hero's friend, so everyone can also see the harem scene.
