I've Become the King of Villains in the Game - Chapter 4 - Hidden Task

Raised as nothing more than a weapon, Xin Long was kidnapped and forged into a killer — his freedom severed, his name reduced to a whisper. In a world where trust is a death wish and mercy is a myth, he treads a path of blood and betrayal, outwitting ruthless foes and surviving inhuman trials. Yet, the deeper he delves into the shadows of Jianghu, the more he unravels a web of dark secrets that bind the martial world.Step into the dark side of Jianghu and witness the so-called Forgotten Tale — a story never meant to be told...

His friend and his wife betrayed him. The only thing left to him was his massive debt and his precious daughter. He was without hope as he lived at the bottom. However, a last chance had come to Sungyoon. He was a ‘man without a heartbeat’, and he will explore the Moon’s Labyrinth. He’ll explore the parts of the dungeon yet to be seen!

Xie Jingyuan, the master taoist of Qingxu Temple, was reborn into modern times together with the cat demon Su Miaomiao.

Su Miaomiao: That classmate’s dried fish seems delicious.

Xie Jingyuan: I’ll buy one for you, don’t steal it.

Su Miaomiao: It’s raining, Taoist Priest, come here and pick me up.

Xie Jingyuan: I’m busy.

Su Miaomiao: It’s okay, a male classmate is willing to drop me at the dormitory.

Xie Jingyuan: … Send me the location. ·

- Description from Novelupdates

A world from another dimension suddenly appeared in the Milky Way galaxy and collided with the earth. A spatial collapse occurred, which allowed the monsters crossing over from the other side to invade various countries, and the earth fell into great calamity.

The military was powerless against the invasion because modern weapons didn't work against monsters from another world. Under the desperate situation, a god-like figure appeared and bestowed blessings upon the humans to awaken their power. From then on, the earth regained its hope, and these extraordinary people were called Realizers.

Tenku Okuihara is a five-year-old boy who dreams of becoming a Realizer to protect the world and his family. But an incident changed his life goal from a hero to a grim reaper.