I Am A Matchmaker on Taobao - Chapter 47:

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Lin Chen, a poor boy from a model agency, occasionally inherited a peerless doctor. From then on, he has been unparalleled in medicine, able to resurrect the world and help the world.

He contends with the sun and the moon, and takes his life to heaven and earth. And all this began when that sexy and beautiful model gave him an ancient book…

- Description from MTL

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled…. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.