The Rebirth of My Father in the Body of an Aloof Academic Genius - Chapter 10: Quit Smoking

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates

Layland Kleinhaus (17) suffers from hypogonadism that makes him less “manly” on top of having a girly face. He is bullied because of it, but he always remains strong ... At least, until he can't bear the betrayals and sufferings anymore.

Filled with rage, indignation, and the lust for blood, he decided to end the life of his tormentors along with the bystanders before taking his own life.

Alas, in the middle of his deed, a mysterious being intervenes the act by summoning him and the rest of the bastards he is killing to another world. He curses his bad luck for not being able to fulfill his revenge because of it, but much to his surprise, there is something much better than having his revenge waiting for him.

“Layland... Be a Demon King.”

Thus, his journey of becoming the unparalleled Demon King begins.

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Those who know me are already in the know of my “condition”—minor dyslexia. So, if you find any misspell or 'wtf does this even mean' words, I hope you can pardon me from the insult, and notify me instead.

What people do, heaven sees. Evil-doers will receive punishment. But there is always someone who thought that because they have the protagonist halo, they could do whatever and bully whomever all they want without any consequences. Then, let’s just remove their halo and tear down their mask of hypocrisy. Let those scum men and goody two-shoes experience “putting yourself in other’s shoes”, so they would know they were at fault.

At first, Lu Jingqian thought he had to sacrifice his body in order to complete the task. But there are three benefits in doing so; having great items, living a good life, and having a high face value. After a long while, he also felt quite good… what to do?

System, “Can you be more modest? Please remember when you first rejected the idea, what about those just and upright words you said before?”

Lu Jingqian looked at the sky, “Modest? What’s that? Can it be eaten?”

- Description from Novelupdates