MTL - A Sorcerer in the Detective World - Chapter 3 Didan High School, Class B, and Xinyi is a classmate.

This is a story of an ordinary boy gaining unusual powers from his nightmares… It all started when Lin Sheng experienced something strange on what he thought was just another normal day. He begins to have recurring dreams that lead him on an incredible journey of discovery as he encounters spine-chilling monsters and elusive secrets.

- Description from Novelupdates

Within the virtual world of “Avalon Online”, Finn, or otherwise known as “Echo” within the game, was one of its greatest players. After logging off from a long session, however, he notices something awry outside of his apartment.The streets were flooded with chaos, screams echo through the night, and hell is loot loose. Monsters from Avalon Online are running through the streets, wrecking havoc. In the midst of this hellish awakening, Finn is greeted with the one gift bestowed to humanity in this dark hour:[...Assessing life experience…][Assessment Complete][Name: Finn Thorne][Age: 20][Designated Class: Assassin][Starting Level: 5][A [Legacy System] has been bestowed to you for your accomplishments within Avalon.][Assimilation System Awakened.]In this twisted turn, as the world as it was once known is gone with the arrival of magic and monsters, the remnants of humanity must level up if they wish to survive.Finn is left in this dark, hopeless apocalypse, using his own experience from Avalon Online to best survive what seems to be an impossible task.

Amidst a disaster, an orphan contracts a sickness.

Jumping From World to the world: Intergalactic or Urban, World of Cultivation or Continent of Magic, Fighting other protagonists, hooking with beautiful heroines, plundering treasures, and suppressing a myriad of people, Our Protagonist(Villain) can do it all.

After living an ordinary life for years, a man finally got transmigrated to another world. He woke up in the body of a boy named Jun Tianyun.

“A world which got its own protagonists and villains, am I just a side character?” Jun Tianyun mumbled.

Thankfully, he activated Heaven's Fortune System.

“Jun Tianyun! You crippled my power and stole my wife! You villain! You will be punished by heaven!”

A protagonist screamed as he coughed a mouthful of blood.

“I didn't do anything. It was your fate!” Jun Tianyun explained kindly.

“Brother Jun! Because of you, I am still alive and living a normal life with my wife and two children. You are a saint!”

A villain spoke with an emotional voice.

“I didn't do anything. You earned your chance of redemption.” Jun Tianyun sighed.

[ Ding! A female with high Destiny Point is detected! Whether Host wants to steal her destiny or conquer the heroine?]

“This...” Jun Tianyun fell in dillema.

“Sigh, Changing the fate, So burdensome.”

Jun Tianyun sighed as he saw a bunch of heroines fighting for him.