In the World of Sword and Magic as Space Marine - Chapter 28: The Victory Feast

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Every novel has a slag character, the one who decides to abandon the protagonist at his lowest, most helpless point, either because he can’t stand the poor guy’s circumstances or for other reasons. But after the protagonist wins his way in life again, they’re the ones who beg with broken sobs to be taken back.

Still, water once spilled can’t be recovered again.

Yet the unlucky Shen Jiayan has been bound to a Water Recovery* System to do just that.

*water recovery – comes from an idiom that means “spilled water can’t be recovered” (English equivalent: there’s no use crying over spilt milk).

- Description from Novelupdates

The character he raised was a completely useless one which couldn’t even be used to see the ending, in other words, a total failure.

Not impossible, but refused…? It was absurd for a moment.

He woke up in a strange swamp in the middle of nowhere. As the very loser he had raised. “…In the first place, I wasn’t downloading anything illegal.”

A dark era running towards destruction. A survival story of a complete loser in order to return safely.

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They whisper my name in fear. Justin Black. The guy who sits in the back of the class, always in black, always untouchable. The one everyone watches but no one dares to approach.They don’t know me. Not really.Because if they did, they’d stay the hell away.I don’t do friends. I don’t do relationships. I don’t do attachments.But then there’s her.June Matthews—cheer captain, golden girl, a walking distraction. She’s everything I hate… and yet, she’s in my way. Assigned to me. Forced into my space. Testing my patience.She thinks she can handle me.She’s dead wrong.Because I have a secret. A place where I go to release the darkness inside me. Where names don’t exist, where pleasure and pain are one and the same. A world where people fulfill their deepest, most twisted fantasies.June doesn’t belong in my world.But the longer she stays, the more I want to pull her under.And once I do… I’m not sure I’ll ever let her go.