MTL - The Kryptonian of a Certain American Comic - Chapter 4 4. You failed the city

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

I found myself drifting into an Eastern-style romance fantasy novel that I didn’t even finish reading.And to make things worse, I became the younger brother of the female protagonist who didn’t even exist in the original story.My motto in life is to work as little as possible while earning as much as I can.Seol Tae Pyeong, a third-rate warrior, whose sole goal is just to live comfortably.But from a certain day onward,I monopolized the love of the Princess Consort of Cheongdo Palace.“Let’s survive.”Nothing is too much.When it comes to survival.

This story is about the romance that blossomed between a beautiful princess and several courtiers, told through the various positions they experienced together.

Reborn into her younger years, she's determined to rewrite her fate.This time, she'll earn her own fortune, buy that dream villa, outsmart every scheming character, and never hesitate to protect herself—even if it means hardening her heart.Her (blinking in disbelief):“Wait… does this mean I'm now on the same level as a rich tycoon?”Him (smirking):“Not quite. You're already standing on the tycoon's foot.”