MTL - Start with Psychologist - Chapter 780

Zhang Xuan traverses into a foreign world and becomes an honorable teacher. A mysterious library appears in his mind. As long as it is something he has seen, regardless of whether it is a human or an object, a book on its weakness would be automatically compiled. Thus, he became formidable.

“Emperor Haotian, why don’t you like to wear underwear? To think that you’re still an emperor, can you pay more attention to your image?”

“Fairy Linglong, if you continue to suffer from insomnia, you can always look for me. I have a way with lullabies!”

“You as well, Qiankun Demon Lord, can you cut down on the garlic? Do you want to stink me to death?”

…

This is an incredible story about the heritage between teacher and students, cultivating and guiding the world’s strongest experts.

Enemy of the world, cursed by all, Kim Sungchul goes on a quest to prevent the ‘prophecy of the end’ from coming to pass.

But no matter how much he raised his strength, there were still some things he could not achieve with physical strength alone.

Resolving to obtain the power of magic, he goes into hiding to learn magic from his most hated of enemies, The Mages.

Su Ran, a music prodigy, woke up transmigrated into a book.

At that point in time, the main story arc in the book had already been completed. As a villainess female supporting character, not only did she need to take over the original owner’s pitiful life in poverty, she also gained an instant son right at his rebellious period.

Ten or so more years from then, the son would turn into a twisted, evil villain. He would appear in one of the extra chapters to pick on the male and female lead’s children.

***

Su Ran: Son, you shouldn’t be too outstanding.
Su Han: Why not?
Su Ran: ’cause you will be killed.

Su Ran: Son, would you like to learn music from me and become a zen, little fairy boy who only needs to drink dew.
Su Han: No, I want to go into business so I can support you.

- Description from Novelupdates

This world is not only as the public knows it; there is an underworld that ordinary people don't encounter.Government agents handle troubles in the shadows, while corporate assassins privately deal with issues.Assassins, mercenaries, arms dealers, and spies exist, along with a dark web that ties this world together, and tycoons who attempt to control everything with money.Gao Yi entered the underworld, unbeatable in close combat, carving out his own domain.But there are guns in this world. Beyond seven steps (close combats), guns are faster.Within seven steps, guns are both accurate and quick.Only within three steps does Gao Yi's punch become faster.Unable to beat them, he chose to join them, aiming to rule them all.To rule everything, become the king of killers in the eyes of mercenaries, the king of spies in the eyes of assassins, the king of killers in the eyes of spies, and the king of intelligence in the eyes of arms dealers.Until he is crowned king by the entire underworld, Gao Yi is the ultimate firepower.