The supporting character's harem is very normal - Chapter 438 Make a choice

She was a famous plastic surgeon in the 21st century, both at home and abroad. But one day, she transmigrated to become a young lady in the Prime Minister’s Mansion and got bullied. The concubine hung her up and beat her, forcing her to marry a fifty years old general as his second wife! But unexpectedly, she received an imperial edict and was asked to marry the emperor’s fifth son – the Evil King.

Who was the Evil King? A gunpowder explosion destroyed his appearance and one of his eyes. After waking up, Evil King’s temperament changed drastically. The handsome young man became a bloodthirsty and cruel tyrannical king. This was not even the most frightening thing. It was said that the Evil King had four wives, but none of them had lived over a month!

Last night, the Evil King’s fourth wife died. Today, she was tied up and sent to his mansion …

- Description from Novelupdates

“But he is a good man,” she argued to see his eyes narrow at her words.

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

When Logan and his classmates are suddenly transported to a world teetering on the brink of destruction, they find themselves thrust into a desperate battle against a relentless demon invasion. In this new realm of magic and peril, each student discovers unique powers to aid humanity's fight for survival. However, Logan's ability to tame creatures is deemed the weakest among his peers, earning him scorn and ridicule.Despite the doubts of those around him, Logan's determination never wavers. As he bonds with mystical beasts and uncovers their hidden strengths, he begins to realize that his power might be the key to turning the tide of war. With every creature he tames, Logan grows stronger, proving that true strength lies not in raw power but in the heart and courage to stand against overwhelming odds.Logan's journey is not just about battling demons; it's also a personal struggle against his own loner personality. Having always been an outsider, Logan must learn to trust and connect with others, both human and beast. His solitary nature is challenged as he forms unlikely friendships and alliances, discovering that unity and cooperation are essential in the fight for survival.