The Best Assassin, Incarnated into a Different World's Aristocrat - Episode 21: Assassin will make it

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded “By the time you hear this, I guess I will be already dead….”

Obelisk, the Tower of the Sun God, a world where several universes and dimensions intersect. In this world, his brother had fallen victim to betrayal while climbing up the tower. After learning the truth, Yeon-woo decided to climb the tower along with his brother’s diary.

“From now on, I am Jeong-woo Cha.”

In another world called Blue Star, the famous son of wealth, Dorian D. Tian, is thrown into a whirl of unfortunate circumstances, resulting in his death.

His parents had a brutal car accident that left them in a coma, and his uncle had quickly taken over the company, seized the company, making sure that he was financially crippled for good.

With that, the famous young master struggled desperately.

And in the end, he gave in to his despair and depression, leaving the sad, lonely world.

The end?

Heh... Think again!

Because in that brief moment, the lifeless corpse suddenly opened its eyes, revealing a deep calm look.

That's right. Another mysterious soul had entered the body.

But if one thought that this story was just about revenge, then sorry... that wasn't even the half of it!

....

The mysterious entity suddenly triggered an exorcist system.

And from then on, both humans and even those from the underworld shuddered in fear and despair at the mysterious soul's cruelty.

[Humans]: “Demon! Demon! You're definitely a demon!”

[Demons]: “Help! Help! The famous demon wants to eat me!”

[Evil Spirits]: “You!... Are you the one who is an evil spirit or us? Why the hell did it seem like you're the demonic one instead?”

[Ghouls]: “You stay away from me! Stay away from me now, you evil entity!”

[Hellhounds]: “Are you sure that you're not the son of hades?”

The system couldn't help looking at its host in doubt.

Its indicators said that its host was indeed mortal. But why did it feel like something was wrong with its host?

Dorian lightly chuckled in amusement.

He would also like to ask the same question.

What exactly was his identity?

Well, this would be the biggest mystery of all.

But Dorian wasn't in a hurry.

Who were his enemies, and who were his allies?

Soon, he would find the truth.

In the meantime, why not play a little?

“Demon! stay back!”

“Oooo~~~... I... I want to go back to the underworld where it's safe.”

“Run for your lives! The demon is here!”

…..

“First were the Gates, and now you’re saying the world has been invaded by Aliens and we’re soon going to be turned into livestock…? Great…”—----------------*Ding!*[You have awakened with the Idle Evolution System!]“The wha—”Suddenly thrown into a magical parallel world of the Earth he once knew, Cassius was greeted with powerful beings known as Hunters and the terrifying Gates that plagued the world. Moreover, he received a message…[To Idle, one must stay proactive!][Firstly, you require Character Development!]“Character Development…?”[You seem a bit (A lot) overweight, and you resemble that of a goblin! What say we start there!?]{[Daily Quest 1:]}_________________[Daily Quest - To Idle, one must stay proactive.]GOAL[INCOMPLETE] PUSH-UPS — [0/100][INCOMPLETE] SIT-UPS — [0/100][INCOMPLETE] CURL-UPS — [0/100][INCOMPLETE] SQUATS — [0/100][INCOMPLETE] RUNNING — [0/10km]REWARD - [1 Point in Charisma, 1 Point in Agility, 1 Point in Strength, and 1 Point in Endurance]_________________“Is this torture!?” shouted the ugly, obese transmigrator Cassius.*Ding!*[No, it’s Character Development! ^-^]—----------------100 years ago, Earth was suddenly overwhelmed with the appearance of Gates and the horrifying monsters within those mystical portals. That was the First Major Calamity.Now, one hundred years later, the next major calamity has arrived—the subtle invasion of an Ancient Alien species from deep into the Milky Way Galaxy. Its undercurrents spread far and wide, with the threat an apocalyptic one. Yet, that is but the 2nd of Three Major Calamities as per prophesied by the famed prophet, Baba Yaga.The Third Calamity, and the most dangerous of the Calamities, is one that will bring about the true END of the world, but only if the Second Calamity can be overcome by humanity…What does this Third Calamity detail, one might ask…? To know the answer to that, one would have to brave past the first Two Calamities and stare into the abyss, praying to all Gods known to man that the Abyss does not stare back also into you…

Warning: This is a rewrite of my previous fanfic— Every Hole is a Goal.Current World: Avatar: The Last Airbender***Executed for escaping his owners, Nik met a relieving fate of beheading with the circumstances of his corpse unknown yet having an honorable end of his corpse is not his greatest concern for he is given a chance at life again. Of course, this meant Nik now worked for an organization that sent individuals like him throughout the omniverse for some reason unknown to him.As they say, if for the penny, in for the pounding.Nik: Wait... I'm not a prost... ehm, rental 'helper' anymore. Do I still charge?An adventure of a lifetime, they say. One that never ends.***Note:1) I don't own any original lore.2) This is the most standard 'collection' type harem novel you will ever see, so, if this is not your taste... well, give it a shot still and see if whether the other aspects of fanfic can cover them or not.3) All the characters I write smut about will be 18+. I will make sure to tweak the fanfic a bit in that way to make sure that the story itself adapts to these circumstances.4) If tags like an orgy and incestuous relationship are not your cup of tea, then... this may not be the 'one' fanfic for you.5) If men and women of sexual 'socialness' more commonly termed as floozy and even more degenerative terms most likely known to you all is not your cup of tea, then I apologize once again, this fanfic may not be the 'one.'6) There is no ntr, but there may be netori.