I will marry you in a thousand years. - Chapter 39: Man-eating Trap (VI)

In the current era, people are either normal or are with ‘special abilities’. Cases related to the latter are managed by the “National Anomaly Prevention and Control and Special Species Management Office”.
Qi Zheng Emperor Sheng Lingyuan was reawakened a thousand years later after he jumped off the fiery Red Lake. Xuan Ji, a newly transferred staff to the Reparations Division of the Deviant Control Office, finds himself having to clean up the mess of a revived tyrannical monarch. The two seemed to share something from the past, but unbeknownst to them, a big conspiracy is stirring right underneath their noses that could destroy the balance of the world.

- Description from Novelupdates

I thought I had been abandoned,But I was actually the child that the Namgoong family had been searching for.It wasn’t until I was killed by the Blood Demon, whom I had called “teacher,” that I learned the truth. When I awoke again as a thirteen-year-old child, I decided to return to the Namgoong family.I didn’t seek to be recognized as family.I only wanted to prevent the Namgoong family from falling apart as it had before.“This is the jewelry, silk, gold bars, and elixirs that the family head has gifted to you.”“Here, little one. This is a congratulatory gift for your return.”As soon as I was recognized as the lost granddaughter of the Namgoong family,I gained delicious food, fine clothes, gold and silver treasures, and a high-quality sword!I also gained a grandfather and a father who cried and laughed for me.But what was that strange, tingling feeling in my chest every time that happened?In order to protect the smiles of those I had once killed,and to preserve this warm and ticklish sensation for as long as I could,I was determined to change the bloody future that awaited me, unlike my previous life…**Namgoong Mucheon’s face darkened.‘Is this child truly raised to be an assassin?’The sharp killing intent and the sword techniques essential for an assassin were reflected in her life, as if they were embedded in her very being.‘Damn brat.’Anger surged within Namgoong Mucheon.He restrained himself from cursing aloud in front of his granddaughter, muttering in his mind instead.‘How dare they raise my granddaughter as an assassin?’The blue energy surrounding Namgoong Mucheon grew even stronger.

In the beginning, when they all thought that she was “he”….

ML #1: We will be brothers for life!

ML #2: This time I’ll reluctantly let you have the #1 seat.

ML #3: I will properly repay royal teacher!

ML #4: Ah Rong is my closest little brother, I trust him.

Afterwards…

MLs: I’m seriously such a fool.

MLs: What do I do, I think I’m gay. I fell in love with my bro/rival/teacher….

Afterwards….

MLs: I’m straight! As straight as steel!

Note:
MC is a girl crossdressing as a boy, she knows how to fight, and naturally possess the gold finger halo from the author.

All the ML(s) is the same person, 1v1, sc, HE

- Description from Novelupdates