Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Volume 17 Chapter 34

The most famous deed of this princess was her words to her younger brother Liu Ziye.

When he became emperor, she told him, “Although your highness and I are of different sexes, we are the children of the same father. Why can you sleep with so many different women, while I must be only with my husband? This is so unfair!”

And after the Emperor Liu Ziye heard his elder sister’s words, he ridiculously thought it made sense. So he immediately corrected his “wrong ways” and painstakingly selected thirty handsome youths for her to enjoy.

Chu Yu awoke in the princess’s body and realized that she had obtained a male harem of three thousand; should she take just one to drink, or keep all of them?

- Description from Novelupdates

Lin Jing had transmigrated.

And he had unlocked a System Space with its own Spirit Field.

Thus...

While others sought out the Secret Realm, he was farming.

While others fought over resources, he was practicing Alchemy.

It was in this way that he slowly grew with the passing years...

Until after countless ages, someone finally realized that the great one was actually him...

This book is also known as:

“First I Farm, Then Do Alchemy, I Seek Immortality by Holding On to Life”

Holo’s life was once a series of relentless hardships—bullies at school, abusive parents, and heartbreak at the hands of those he trusted. After a failed suicide attempt, a mysterious man offers him a deal: help rehabilitate four psychopathic girls, and in return, earn ten million dollars. Desperate and naive, Holo accepts, not realizing the chaos and danger awaiting him.Each girl comes with her own dark tendencies—Trixie, a violent and feral girl who acts on impulse; Scarlet, a master manipulator who delights in breaking people down; Felicia, a dangerously seductive woman battling a sex addiction; and Eleanor, a cold, calculating girl with a desire to watch the world burn. As Holo works to bring out their humanity, the girls become obsessively devoted to him, their love transforming into something darker.

A side story series featuring the girls of Kyoukai Senjou no Horizon.