Billionaire's Secret Twins and Rebellious Wife - Chapter 861: As Long as You Reveal the Secret Between Yuan and Me

A cultivation story about how a declining sect is restored by a narcissist, a troublemaker, a meanie, an idiot, and a wimpy kid.

- Description from Novelupdates

Diablo Volfir, a mighty magician, was sealed for aeons due to the schemes of the 12 Gods, but 66666 years have passed since then, and he descends to earth once again!

Left out during the elementary school picnic.

[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.