Citadel for All: The Only Unit Angel at the Start of the Game - Chapter 29: Key Words! Wave ads!

In a world entrenched by monsters filled with myriad factions, state disputes run wild. Amid these troubling times, martial arts have come to prominence and prosper.

Xu Ning transmigrates to this world with a Martial Arts Panel and becomes an ordinary villager. He only has one goal in mind: to become a master of martial arts.

Spend three energy points to level up Gale Knife Technique? Yes/no

Yes! Hell yes!

The world experienced a cataclysmic change, and countless spatial gateways appeared out of thin air.

When an S-class elite assassin-raised captain of a special ops suicide squad comes home from a high-stakes Africa mission, he finds himself offered something that could potentially set him up for life- a curious assignment that he could use to finally exit his days of war and slaughter.

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