I opened a shop on the Astral Train - Chapter 40

Untolerated by heaven, a boy was restricted by the most powerful spell.

He accidentally acquired a painting inhabited by nine souls that claimed to be immortal.

Then, the legend of a strong young man who violated heavenly principles against the course of nature began.

- Description from Novelupdates

Qin Mu was transmigrated to a world filled with fierce beasts and endless chaos.But from the very beginning. fate granted him the Invincible System --- a power that defies all laws.From that day forth, his strength increased without limit.The cultivation bottlenecks that had trapped countless powerhouses were shattered overnight.Ancient laws that could only be seen by genius among genius? Understood in a moment.Trial after trial that destroyed genius for generation? Cleared without moving an inch.And as his strength grew, the world trembled.Across realms and races , no one could stand in his way.At the peak of creation, Qin Mu Stand alone ------ crushing all beneath his invincible rise.

A high-ranking officer in the Marines and a master of both Western and Chinese medicine, Feng Yu Heng is transmigrated with a duang sound to the Da Shun Dynasty.

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates