10 nen goshi no HikiNiito o Yamete Gaishutsushitara Jitaku goto Isekai ni Ten'ishiteta - Chapter 3, Part 7 Bulletin Board Yuuji, Feeling Nervous Checking the Balance in Net Banking.

-Daughter? Yes!-Multiple worlds? Yes!-Vast Lore? Yes!-Fastpace? Yes!...“You either Die a Villain or Live long enough to see yourself as a Hero.” ~Probably Spark---------------------------------------Spark, the lofty young master of the Dwight family, had always been a mystery. His true abilities were never known until the day he stepped onto the frontlines.In one awe-inspiring exhibition of power, Spark shocked the world and sent the coalition army of the five emperors into a chaotic retreat.Now, with the eyes of the world on him, each faction lusted to uncover the secrets behind his unparalleled strength.Still, in spite of the rampant curiosity and greed, nobody had the guts to confront him directly.And with every rumor spread of his feats, a question burned in every mind: was Spark this powerful all this time, or was he casting an illusion of strength before everybody's eyes?

A campus bullying incident led Chu Feng to receive a message of Rong Yun’s suicide after ten years.

Rong Yun’s relic is a novel based on him…

At this point, he came to know that Rong Yun had always liked him.

In deep regret, Chu Feng returned back to high school.

This time, he wants to protect Rong Yun, his achievement and let him have a different life.
At first, he only wants to compensate for his mistakes, but he didn’t know when his compensation become’s true love.

- Description from Novelupdates

An ordinary student, a wretched peeper, a cowardly teenager with a kind heart. In a terrorist attack, he inherited the knowledge of countless elites, embarked on a path of God Jagged Tu…

He is an artist!

He is a mathematician!

He is a psychology Doctor!

He is a master of fighting!

In fact, he is a man

Taken off raw site:

A wretched, dirty young man is working during the summer when he was caught up in a mysterious explosion. After that explosion, the young man is then left with the memories and knowledge of dozens of the world’s experts.

He has changed, his heart has become cold, iron-blooded. He became a killing machine, his mind turned mechanical, calculative. Everything goes according to his plans and calculations!

In this magical, slaughterous world, a door is opened for him…

- Description from Novelupdates

Beings that create and control monsters and demons, beings that build and reign over malicious labyrinths, the chosen individuals to possess an overwhelming Unique Skill… They are the Demon Lords.