Witch: Accumulate Experience Through The Knight Breathing Technique - Chapter 37

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

Cho Kang-hyuk, the owner of a large fitness center, woke up to find himself a young disciple at Shaolin Temple.

Overnight, the whole world became gamified in Su Mo’s eyes

Not only can he use his life to draw cards

You can also see the hidden attributes of real objects

then–

He looked at the chandelier above his head:

[Item: A dilapidated chandelier]

[Hint: There is still one minute and seven seconds to drop]

Turning to look at his right hand:

[Item: A piece of the right hand of a young man]

[Hint: Due to long-term training, the grip strength is 3% stronger than that of the left hand]

Then look at the ginseng on the table:

[Item: A wild ginseng]

[Hint; it is contaminated with a trace of origin qi, eating it may make you more energetic]

…

Su Mo excitedly ran to meet the school girl who had just confirmed the relationship.

I saw a bright red streak of blood shining on my girlfriend’s head:

[Item: A Very Hungry Fox Demon]

[Hint: You may not be her opponent]

- Description from novelbuddy

I have been summoned to a game world, a world of swords and magic. Or at least that's what my friend said.I couldn't care less about that.But apparently, I can create whatever eldritch creatures I want, even the ones from urban legends and creepypastas.So what if the people don't like my babies? Screw them.This is the story of how I accidentally became the last boss of the world.