Entering Horror Instances [Infinite]

This one is from earlier.

Also known as "I Met the Creator in the Game World"

Yun Ji wakes up in an abandoned laboratory with no memory and enters a horror instance. First comes a bizarre old man, then a moon that turns red, and then a monster with only half its head left.

With the help of Chi Zhou, a teammate whose expression is cold but who often lends him a hand, they uncover the secret of this System.

Theme: Study, study