City of Sin - Book 9, Chapter 107

Qin Tian accidentally transmigrated into a sickly body, a body with broken Dantian that was unable to practice Qigong, in another world. Fortunately, God had mercy on him by giving him a level up system. Useless? That was him in the past. Not worrying about practicing Qigong, he was now able to kill Monsters to level up. Easy! Level up when killing Monsters; level up when killing people. An unbeatable sovereign of the clan in the eyes of other people, but in his eyes, he is a glittering big BOSS.

With this level up system, he will no longer encounter any bottlenecks during a breakthrough in cultivation like other geniuses; all he needs to do was kill as many monsters, clan heads, sovereigns, world experts … to have a better life.

Dedicating his life on a road to become an expert.

- Description from Novelupdates

I’ve had enough of being transmigrated into books.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

“You don’t want to be forced to match, right, Lin Changan?”

The delicate-looking girl asked softly, and pushed the “Personal Subject Relationship Contract” to Lin Changan’s eyes.

Lin Changan’s eyes were full of despair, but fortunately, he awakened the simulator system, which could simulate life infinitely.

After each simulation, you can choose talents, realms, combat experience, cultivation insights or some memory fragments.

[You rejected the “Personal vassal relationship contract”, signed an implication with a girl, was killed by a love rival in the dungeon, and you died. 】

[You chose to eat soft rice hard with talent. 】

[At the age of 22, the sickly junior girl confessed to you that she was rejected by you. Since then, she will poison you quickly because of love and hatred. 】

[You chose a talent that is invincible. 】

[At the age of twenty-four, the beast tide struck, and you were drowned in the beast tide. 】

[You have chosen the realm and condensed the power of the stars. 】

[At the age of twenty-four, the beast swarms attacked you. As a general, you were exhausted and drowned by the beast swarm. 】

[You have chosen an inexhaustible talent. 】

[At the age of twenty-four, you went to the front line to resist the beast tide, and your spiritual power is inexhaustible…]

After countless simulations, there are stars twinkling in your eyes, and every move is blessed by heaven and earth.

【The simulation starts! 】

【You are invincible, the universe is respected! 】

- Description from novelbuddy