MTL - Marvel: I Get the Power of the Spell To Play Superman - Chapter 130

Have you ever heard the story of the monster?

Have you ever thought that monsters have always existed, and they are lurking around you?

Have you ever thought that the reason why you are still safe is because the profession of “Monster Slayer” has existed for thousands of years?

Wang Qianchen turned into a monster when he woke up, and was ruthlessly hunted down by the monster slayers, and since then he has also entered a strange world!

- Description from novelbuddy

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?

Hiding in the Cold Palace and eventually becoming a Boss of Sorts. Li Mu was transported to a fantastical world and became a measly eunuch of the State of Xia. Despite having initially thought that his life would be a miserable one, he had unexpectedly acquired a check-in system.