She's a Passerby, But Can See the Protagonist's Halo - Chapter 16

Du Fei was reborn, and in this difficult era of extreme shortage of supplies, he started his wonderful life of opening and hanging…

- Description from novelbuddy

This novel is also known as Transcendental Mechanic

What do you do when you wake up and find yourself inside the very game that you love?

What do you do when you realize you that you have not only become an NPC – you have even been thrown back in time to before the game even launched!

What will happen when our protagonist’s two realities coincide?

Han Xiao was a professional power leveler before his transmigration. Using his past life’s knowledge, Han Xiao sweeps through the universe as he prepares for the arrival of the players. This is definitely not your typical transmigration novel.

- Description from novelupdates

In a world where monsters dominate, and humans are but one out of ten thousand of the population, Gao Yang, having transmigrated to this world at the tender age of six and led the life of a normal boy until his eighteenth birthday, must seek the truth and survive against all odds—with the help of a mysterious system, a bottom-of-the-list Talent, and the companions he meets along the ways.

What is hidden under the facade of an ordinary city and its ordinary occupants? What are these different manners of monsters, and where is the line drawn between monsters and humans? Could relationship and love be true when all are merely playing their own parts?

Ride along on his journey and find out!

Official blurb translated from Chinese:

An orphan, Gao Yang transmigrated to a parallel world at the age of six, and he was given the gift of a loving family of five.

However, with the coming of his eighteenth birthday, Gao Yang found out by chance that this is no parallel world, but a strange domain where his family and friends can all be terrifying monsters! He almost got killed when he realized the truth, and he would, if not for the system and Talent he acquired at the last moment, Lucky—the longer he lives, the stronger he will become!

Now commenced the battle royale of a lamb among wolves…

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The hearse with the weird odor slowed to a stop before the entrance. The sound of pebbles could be heard bouncing on the ceiling. There were footsteps coming from the corridor, and there seemed to be someone sawing next door. The door knob to the room rattled slightly, and the faucet in the bathroom kept dripping even though it had been screwed shut. There was a rubber ball that rolled on its own underneath the bed. Wet footsteps started to surface one after another on the floor.
At 3 am, Chen Ge held a cleaver in his hand as he hid beside the room heater. The call he was trying to make was finally answered. “Landlord, is this what you meant by ‘the house can be a little crowded at night’‽”

- Description from Novelupdates