ShuviLily

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.
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Warning: Story with R18 element

Mercenary Harem in Murim Novel

"Ah, no need to thank me. It's my pleasure to help you after everything you've done, Master Leo."

"Please call me just Leo, I'm not a master of anything, Lord Ming. I am not like Lord Yang Ji either, I have no wealth nor power."

"Hahaha, how can the strongest man in the Central Plains say that? Everyone will be jealous hearing you saying this." Ming Yuchan said, "Also, call me Yuchan. There's no need for honorifics between us, right?"

"You're right. I'll just call you Yuchan then. No need for honorifics anymore, right?"

Leo turned to Astrid who sat in front of him, her expression showed her boredom. She fiddled with her hair and looked at the outside of the carriage through the window. Her gaze was unfocused as she stared blankly into the distance.

Chapter 210 – Qin City’s Branch