Isekai Maou to Shoukan Shoujo no Dorei Majutsu - Volume 10 Chapter 1 part5-6

My name is Qin Jue. At only 16 years of age, I'm already the youngest person to ever become an uncle-grandmaster in the Xuanyi Mountain Sect.Also, I'm the strongest being in this entire world!But unlike other transmigrators, I want nothing to do with the outside world and wish to live a leisurely life on a cliff behind the sect, sipping wine and singing songs.That is until one day, a mysterious girl appears in front of my yard…Join Qin Jue as he deals with sneaky sects and greedy, hostile clans, all while raising a "weed" to sentience and creating heaven-defying spirit-energy "guns".

God rewards hard work, and there must be rewards for paying.

And no matter how hard you work, you will gain 100%!

So, for things like cultivating immortals, don’t you just need to have hands?

- Description from novelbuddy

Initially, Lin Mo intended to become stronger through cultivating diligently. However, he discovered that staying idle was more comfortable. Most importantly, he could level up by doing nothing! Since he could achieve his goals by lying idle, why would he trouble himself to stand and work?

Lin Mo transmigrated to a martial arts world and realized that he had no talent in cultivating at all. Fortunately, he awakened the Idle Upgrade System. He could become stronger by staying away from the rat race and enjoying life.

Lin Mo lamented, “It’s not that I don’t want to work hard, but truly, there is no opportunity for me to do so.” As such, the most bizarre Martial Arts Saint in human history was born.

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