MTL - Shanwa Small Rich Farmers - Chapter 6 unexpectedly popular

[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.

【Explosive Fantasy, Exhilarating Fiction】He had been beaten by his father into a cripple and kicked out of his home, yet he was the most badass genius in history. The Empress of the Divine World? She’s my woman! The Great Lord of the Demon World? He’s my disciple! The Dragon God of the Demon Realm? He’s my mount! Those who mess with Xu Nian will die! Those who touch Xu Nian’s Forbidden Lamella will wish they were dead!

This is an extremely difficult game, if you don’t have enough skills, don’t even think about going out!

- Description from Novelupdates

By the fourth year of Su Wan's career, every league rookie hears the same warning from their coach and veteran teammates: “You can try to impress him. You can even try to defend him. But no matter what—no matter if he hurls the most brutal insults your way—never, ever talk shit to him!”