This Is Eternal Hunting

(Tingfeng is the sole female lead; original setting, and the protagonist isn't invincible.)

An infant orphaned in a demon attack is taken in by Rhodes Island, which was then still Babel. He grows up to become an elite operator. At Muelsyse's request, he returns to Sami as Magellan's escort. There, he meets Tingfeng and learns the truth about his origins. He decides to stand by her side and take part in the eternal hunt with her.

“Don't touch it. I told you, nobody is allowed to touch my bow. Not those blacksmiths, and not you either. You don't have what it takes to hunt it in return, so don't let the shadows deep in Sami find you. I've met plenty of people like you. It's fine, I'll say it again, and again, and again!”

“Yes, little typhoon!”

“Don't call me little typhoon!”

“Okay, little typhoon!”

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