The supporting character's harem is very normal - Chapter 121 My mother is not a prostitute!

When he returned to the World of Martial Arts, the game was filled with blood and battles! Chen Kaixin had chased after the footsteps of the one emperor, two empresses, three princes, seven dukes, and thirteen aces for three years, but during the eve of the Sword Among Us tournament in Mount Hua, he was ambushed by evil bastards, and was killed so much that his level dropped to that of a newbie. He completely lost the chance to join the ranks of the powerful players in the game! In great disappointment, Kaixin quit the game and got drunk so that he could forget his sadness, but during that stormy night, Chen Kaixin found that he had actually dreamed for a total of three years, because when he woke up again, he woke up to three years ago, when he was still a student.

- Description from Novelupdates

After dying in an oddly anticlimactic vending machine accident, Kazuki Ren is reincarnated in the demon realm—not as a hero, not as a villain, but as the only human male student enrolled at the mysterious Academy of Ruin, a school where all the professors are demon lords and all the students are powerful, beautiful she-demons.Ren is told he has one task: survive.But there’s a catch. The Academy’s darkest secret is about to awaken, and Ren holds a hidden power that could either destroy the demon world... or rule it.Now surrounded by seductive demons with hidden motives, eldritch tomes, forbidden dungeons, and twisted exams, Ren must master his ability—or be consumed.Magic, mystery, danger, and temptation await in this dark academia harem fantasy.

Nan Gong Xi was a top national secret agent who found herself transmigrated as a female prison guard who inherited her mother’s business.

Her father was the warden, her younger brother was a junior officer, and her mother was a retired housewife. Her family had served as minor officials in the capital city for generations.

She had no special abilities, only memories from her past life. But exceptional people will shine through effort, no matter their background.

Watch as Nan Gong Xi, now called Gong Xiao Hua, grows from a junior guard into a female general of the kingdom.

Qin Chu Yuan came from a prestigious family line, blessed with talent and looks. Outwardly gentle, he was scheming on the inside.

The one correct calculation he made in life was marrying his one and only wife, Gong Xiao Hua. She fell right into his trap.

From then on, the married Qin Chu Yuan became a devoted, doting husband catering to his wife’s every need – to the point that onlookers grew tired of their affection.

Sold by her own grandmother to become a shared wife to the poverty-stricken Ye brothers for twenty taels of silver, Liu Duo, unwilling to succumb to her fate, escaped in the night. She slipped and fell and died an inexplicable death.

Then She, a soul who shared her name, reincarnated into her body. Could this be heaven trying to make amends? She is going to has four husbands? Since what’s done is done, She might as well accept her new life!

Work hard, earn money, get richer, become wealthy, maybe even have some kids! Just as they are living their lives, an array of crazy characters just loves to disrupt their peace. Are they here to taunt her? Take advantage of her? Well, good luck with that! I’m not some sick cat who can’t fight back!

- Description from Novelupdates