The Sage Who Transcended Samsara - Chapter 15: Owner of The Castle

Zhang Lin, the king of Holy Light duel, was smeared by the team’s design and forced to withdraw from the online game professional league.
In order to return to the top, pick up the previous Summoner trumpet to fight against the Holy Light again, and perform the return of the king.
Summoner PK is the weakest? NO, everything is possible in Zhang Lin’s hands!
Play around with the guild, get the best equipment, and make beautiful MM…
Single P, Triple P, Group P, let the horses come over!
The bloody battle ignited the passion. Zhang Lin and his friends stepped over the mountains of corpses, and let tears and laughter witness Zhang Lin’s legendary online game life.

- Description from novelbuddy

500 years ago, Chen Xi was devoured by a crack in the void and was transported into a cultivation world.

Our straight (?) bottom woke up ten years into the future and found himself on the bed of his childhood friend… At the start, the bottom was shocked to his very bones, but he soon quickly accepted this premise and found the whole situation to be rather amusing. Precisely then, the bottom once again went back to his timeline — back to when he and the top were just platonic childhood friends.

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.