The supporting character's harem is very normal - Chapter 16: Evolution…

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates

Kaka: Huang was the biggest contributor to the night in Istanbul, although he played less often.

Ancelotti: Huang is a super genius, but unfortunately he is not in good health.

Maldini: Huang is the most important player in the team. I suggest that the club renew his contract for another 5 years.

Barcelona: In order to sign Huang Kevin, we decided to sign his cousin with an annual salary of 1 million euros to show our sincerity. Milan’s veterinarian is not good, and he will not be injured when he comes to Barcelona.

Bayern Munich: We have a genius doctor!

Kevin Huang, the biggest jerk in football.

From fishing every day, he was forced to play every three to five games, and finally he was forced to become the savior of the team.

- Description from novelbuddy

Once upon a time, an Alchemist Grandmaster from the World of Immortals accidentally took possession of a playboy, who hailed from a rich and powerful family, and became a student in the middle of his midterms.

# LORDXu Yuan transmigrated to a parallel world where everyone became lords. Initially, he thought he would be a lord too. To his surprise, he became the Dark Demonic Dragon, a starter hero awaiting to be summoned by a lord. He also awakened the Dragon God Cultivation System.[Transformation of the Dark: You can level up quickly by staying in the dark.][Slumber of the Dragon God: For the Dragon God, sleeping means residing in the dark.][Rejuvenation of the Demonic Dragon: You can revive using the power of the dark. Your basic attribute points will increase every time you revive.][The Blade of the Hidden Wings: This is a dark attribute AoE skill. It can annihilate all enemies within the area of effect.][Unlimited Devouring: The skills of your enemy shall be yours now. Unleash this skill to devour your enemy and acquire their skills.]…Su Wan, a beautiful lord, had no doubt that she could easily become the most powerful lord in the universe.She felt her heart beating fast when she first saw her starter hero dazzle amidst the flashing summoning light.Unbeknownst to her, her nightmare was about to unfold.While other heroes devoted themselves to training day and night in order to level up, her hero goofed around and showed no effort to improve himself.While other heroes charged into the enemy’s base and valiantly killed off their foes, her hero hid in their base and slept soundly....As time passed, Su Wan slowly discovered that there was more to her hero than met the eye.