World Teacher – Other World Style Education & Agent - Chapter 140

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

Su Lin travels to a post-apocalyptic world governed by rules where he spends his days scavenging for supplies and his nights defending against monsters. The only way to survive is to build his own safe house and engage in tower defense survival.The original host's parents passed away, the defense of his residence reset to zero, and he faced despair and neglect. His fiancée was almost assigned away. Faced with this predicament, Su Lin gains the opportunity to enhance his abilities once a week through select traits.[King of the Garbage Can: Increases the probability of collecting low-level garbage items tenfold and enhances the power and effect of tools and buildings created using these items tenfold.][Glazed Cannon: The durability of your crafted weapon mechanisms is 80%, but receives a 40% damage increase.][White Take: Copy one item or building from a companion's hands every month.][One Hundred Push-Ups: Upon completing one hundred push-ups daily, you receive a 35% damage reduction for the day.][This is Hextech! Not cheating!: Consume any item, and for every ten items consumed, three are returned.]

On an ordinary day, Lucius stumbled upon a strange, run-down shop. At first, he assumed it was abandoned—until he stepped inside.[You have entered the Universal Alchemy Store.][Congratulations! You are now the store’s owner.][Please craft your first potion.]Lucius blinked. 'What kind of joke is this?' But as if guided by an unseen force, he followed the instructions. Minutes later, his first creation was complete.[Love Potion: The drinker will fall in love with the first person they lay eyes on.]Lucius swallowed hard. 'Wait… does this actually work?'Before he could process it, the shop’s door swung open.Standing in the entrance was no ordinary customer—she was an elf. Long, pointed ears, mesmerizing green eyes, and a body sculpted by the gods. A visitor from another world.A dangerous thought crept into his mind.'Should I test it on her?'

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates