Ryongul

[Mature Content]

[NO NTR]

The day dungeons appeared on Earth, everything changed! From ordinary beasts to monstrous ones, attacks were common throughout the globe, and no one was safe.

After countless studies using these beasts as subjects, Humankind developed a serum capable of awakening incredible abilities in humans, leveling the battlefield.

With the serum came heroes and villains, those who wished to use their powers for good or bad.

The Garmony Upper School was a place for the elite with the sole purpose of creating heroes to fight the villains and explore more of the dungeons after the beast attacks increased for no apparent reason.

Damian Romero, a youth who received the serum after turning 18, yet got no unique ability. It was not uncommon for one to not receive power, but it was still a blow to one's pride.

He went rogue after the news, drinking alcohol and having a good time with women, and it was at that moment, when he was putting his toy to play, he got a surprise.

[All-in-One System Unlocked]

Damian's unique ability was a system with multiple functionalities, but after he studied it, it seemed this system worked with a different type of coin called Erotic Coins!

Improve his body? Buy any item or unique ability from his system's store? All Damian needed was Erotic Coins, and he knew how to earn them!

~~~~~
The MC will not start as a villain, but something will shift his mind in the future.

All-in-One System: All I Need is Erotic Coins

He was inside the castle's secret tunnels to not catch any attention; he was whispering through the phone when Neil called him.

"The spy you talked me about. It was too late! They unblocked the dungeon, and the castle now swarms with monsters!"

Damian had spent little time in the castle, but Glen, Neil, Astrid, and hell, even Joffrey, were decent people he cared about.

"For now, yes. With me, It will be hard for these monsters to overtake us, but I know this is only a distraction!‌ The Duke is leaving tomorrow morning with an army to take the castle!"

"What do you want me to do?" Damian asked.

"Kid, can you leave the castle and get the help of your leader? If he stops the Duke's army, we will forever be loyal to him and The Dawn!" Neil said.

Fight in the Castle