Flash Marriage: The Prince's Contract Wife - Chapter 688

[You have entered the dungeon at Gwachun Station’s 1st Exit.] When former high school student Kang Woojin finds himself returned back to Earth after being forcibly summoned to a foreign planet for 20 years, he soon finds that Earth is not the same, normal place as he once remembered it to be.

When the forgotten past and the mysterious future collide, its up to those stuck in the middle to put a stop to it.Join Stanford “SK” Kirby, a mild-mannered deliveryman and amateur comic book writer, as he fights both the monsters of humanity's past sins and the machinations of their future mistakes.But how is someone this unqualified supposed to do something like that?Why, by creating superheroes, of course!“I have no fear, Operator! For I am here to save the day!”“And I just created a literal knight in shining armor. Alright, let's do this thing. AIM FOR THE DRAGON!”“The mechanical one or the anatomically correct one?”“YES!”

The leader of the thousand demons, the Demon God Chun YeoWoon. Due to an unfortunate accident, he had been sent to the distant future.

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

- Description from Novelupdates