Guide To Reign My Tycoon Husbands - Chapter 12: Familiars

In the vast Marvel universe, where superpower was still slowly growing in its infancy, several peerless superheroes tried to find their path in The Marvel Universe. A young adult named Ron from modern Earth unwittingly stumbles into such a world and begins his journey with an unknown power. This is a magnificent yet unknown true marvel world! This is the story of a normal young adult and his adventures!

- Description from Novelupdates

Miracles don’t come walking your way by themselves.

Sun Hao traveled to a world of cultivating immortals. Unable to cultivate, he practices the guqin, chess, calligraphy, poetry, wine, and flower tea are all in the supreme realm. He didn’t know: The pet on his farm was the Nine Heavens God Luan. The lotus in the pond is a peerless demon. The guard outside the door is the ruler of Thunder Tribulation. Later, he discovered: The swordsman who picked up his broken hatchet became the peerless generation of swordsman; the scholar who often listened to him to chant became the ancestor of Buddhism; the girl who came to learn to play the guqin with him became the supreme demon clan. … Sun Hao sat on the throne of Heavenly Emperor, with a shocked expression on his face: Am I a Dao Ancestor? I take the heaven and the earth as the disc and all beings as my sons, and create a shocking situation? I do not know how?

An ordinary (?) grandfather, Choi Chuntaek. In an effort to protect his granddaughter, he started the virtual reality game 'Arkstar.'

Then... he accidentally obtained a legendary class?