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

After escorting Sheng safely, Leo returned to the inn. It was already evening, and the sun had started to set.

When he entered the room, Jessica was sitting on the bed, staring at the sky through the window. She turned at him when she heard the door creaked open

"Welcome back, Leader." She smiled softly. Her gaze slowly moved from his face to the unconscious girl in his arms, "And she is?"

"Yue Yue." He said, moving to the nearby couch and putting her down. "One of the important characters. Maybe you will understand if I say that she's the Hidden Shadow."

Moving next to Leo, she looked at the girl with a surprised expression.

As Leo's secretary, she had been shown some of the information and notes he had written. The name 'Hidden Shadow' appeared as well, and her abilities were described in detail.

Chapter 169 – Becoming Slutty