The supporting character's harem is very normal - Chapter 14: Elemental Stone

The protracted ’witch hunting’ had faded into silence with the end of the Seven Years’ War, and the mysteries of the East Coast had begun to conceal themselves, yet gunpowder was on a rapid rise. Mo Qishang, who should have been utterly confounded, stood at the crossroads of destiny in the name of Arthur. He stared in astonishment at the charging knights, the wizards atop the high towers, and the bizarre wilderness. He felt the sharpness of the longsword and the recoil of the firearm, both clear and unfamiliar. At last, he excitedly shook his robe and, with a smile on his face, said— “Do not believe what I say, for to believe is to exist!”

[You Have Been Chosen.]When the apocalypse started, everything fell apart. I lost my job before they pushed me out into the street. Facing the undead, I became desperate and ran like a coward.Until I heard a voice...At first I couldn't believe the voice, thinking I might be insane and finally lost it... But as I was about to die, I saw a strange game-like panel appear in real life![The Throne System has activated.]This strange system let me gain points by killing zombies and the ability to recruit people as subjects who wouldn't betray me like my previous co-workers.My first subject?Mu Qinglan.The ruthless Ice Queen CEO I once called “Boss.”Cold, untouchable... and now infected.As her bloodthirsty jaws closed around my neck, I barely saved her with the system’s makeshift cure.[Recruitment Available.][Subject: Mu Qinglan (S-Tier)][Press to Confirm.]A glowing button floated before me.I hesitated.Then, slowly, I reached out.[Recruitment Complete.]▼ Mu Qinglan's attributes are now visible.+ 100 Experience.+ Leadership: Level 1+ Random Skill from Mu Qinglan[Rank Up!]▼ Rank: Loser → Partner+ Attributes Increased | Subject Cap: 2Every subject I command strengthens me.Every kill feeds my dominion.In this world of death and chaos...I will build an empire of S-Tier Beauties and ascend as the Apocalypse King.

After the nth time of failing a marriage meeting, Xiang Han got himself a job: good treatment, high salary, free world traveling with food provided, house provided and even a ‘lover provided’?!

At first, he thought, apart from having to travel into the body of a scum cannon fodder, a scheming fake white lotus, everything else was okay. It was only later he realized that saving the target was also a problem. His imagination was neverending, even eating a cup of ramen was seen as a way to rouse his ( target’s) interest!

Xiang Han: This target is a no-go.

Certain Target: Very good, you’ve already managed to rouse my interest.

Xiang Han: Go outside and make a left turn to the optometrist, go get your eyes healed! Additionally, this “lover provided” isn’t necessary.

A Certain Target: This is certainly necessary!

- Description from novelupdates

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.