The Regressed Demon Lord is Kind - Chapter 19

The peerless Demon Lord had been reborn. He used a dragon blade to sweep away powerful enemies from every direction and traversed the entire city, attracting countless beauties.

After putting a suggestion to add a mercenary in a bad Murim novel he read, Leo would finish a mission with his NPCs before sleeping. Or so he planned. For some reason, he was transported into the said novel as the extra mercenary added by the author. His loyal NPCs, a yandere secretary, a happy-go-lucky assassin, a sexy puppeteer, and two weapon maniac guys start to become sentient. He lead his mercenary band ’Hallowed Insects’ toward an an unprecedented future in a Murim most turbulent era while enjoying his time. Fortunately, they still have their futuristic equipment with them. Tang Clan have a Poison Dagger, they have a Photon Sword. Shaolin Sect has a Qi Blast, they have a Railgun. And of course... “How much are you willing to pay to employ us? By the way, Demon Sect pay us 50,000 Golds to join their side in the upcoming war.” ... he always sided with the highest bidder.

There once was a boy who was an orphan and suffered abuse from his village residents. The only friend he had was the dummy scarecrow on the field, whom he talked to. One day, a wealthy man brutally beat the boy. The next morning, the wealthy man was found dead, and the scarecrow was covered in blood. Terrified, the villagers were convinced that the scarecrow had come to life to avenge its tormented friend. And it was the last scarecrow ever placed again in the fields, considering it a sign of death. — After scarecrow dolls begin appearing in the streets of Riddleford next to murder victims, the town is thrown into chaos.When the hunt for the mystery scarecrow murderer begins, it is only a matter of time before the famous Frontier Hall Opera House employees are subjected to suspicion, each protecting a secret of their own. But is that all that is going on? Or is there something unseen?

Gou Liang travels through worlds in order to complete a mysterious and arduous mission…

16 worlds in total:

School Campus: Strawberry Flavored Scholar Gong √
Entertainment circle: Lemon Flavored Film Emperor Gong √
Ancient Time: Honey Tangerine Flavored Shadow Guard Gong √
WuXia: Melon Flavored Senior Brother √
Beastmen: Pineapple flavored Beastmen Gong √
Ghost Spirits: Snow Pear Flavored Dead Gong √
Ancient Time: Gr*pe Flavored Regent Gong √
Apocalypse: Banana Flavored Boss Gong √
Interstellar: Pomegranate Flavored Sentinel Gong √
Modern: Citrus Flavored Aristocrat Gong √
Mecha: Sweet Jujube flavored Lunar New Year Gong √
Ancient Time: Durian Flavored Battle God Gong √
Magic: Watermelon Flavored Blacken Gong √
Cultivation: Cherry Flavored Disciple Gong √
Fantasy: Blueberry Flavored Demon King Gong √
Celestial World: Bayberry flavored Senior Immortal Gong √

- Description from Novelupdates