I, the slave boy, awaken with the most potent seed!! - Chapter 23: Arrangements

A world where the [Demon King] was defeated by a [Hero] that came from another world. People carelessly forgot about their fear of the [Demon King] and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the [Black Ooze]. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and [Desire].

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

Liang Muqiu seriously doubted if he had read the astrology forecast when he went out today.

He borrowed a fire in the bar, but borrowed it from his ex-boyfriend.

It is said that old partners would never contact each other. However, they hadn’t seen each other for seven years, yet this bastard was not only not old, but also more handsome than before.

Especially when Cen Nan lit a cigarette for him in the dim light, his eyelashes drooped slightly, like when he kissed him under the blossoming tree seven years ago.

Liang Muqiu: Damn it, why was he still a little excited?

It took a long time for Liang Muqiu to wake up.

From the moment he saw Cen Nan, what he wanted to borrow was not fire, but a kiss of reunion after a long separation.

After seven years of separation, he still loved the same person.

Coincidentally, so did Cen Nan.

- Description from Novelupdates

This is a story of a man named Kim Sae-Jin, who one day, inexplicably wakes up as a Monster. Follow him and his perilous journey to get his life back as a Human, all the while growing even more versatile as a Monster in the process. This should be… complicated, somewhat.

“He is the entertainment king who is in charge of everything. Been single for years, he had zero scandal. One day, a woman and a girl turned his life upside down.