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

The vampire spilled it out, afraid Damian's sword would kill him. All Damian needed was a little pressure to break the vampire.

"What do you know about this place? Also, how did you leave if this is a dragon's lair?" Damian asked as they flew in the direction the man said.

"T-The dragon was asleep, that's why. But the portal was there, I am certain of it! I saw it from afar!"

Damian analyzed the vampire's body language and how he spoke to spot any lies.

"But who are you, anyway? Why do you want a portal to leave this dungeon floor?"

Damian stared intensely at the vampire who asked that, making him feel uneasy; scratching his hands and looking to the side to avoid Damian's gaze.

"I am the one asking questions here," Damian said.

"I was just trying to mingle, chill. We both know you are the boss here," the vampire said, rolling his eyes.

Dragoon Knight?