 If you liked
Questism
|
 ...then you might like
Reality Quest
|
Both are about a bullied korean teen who gains power of a "system", complete with videogame screens and quests to clear.
Btw, Questism is ptj-comic verse (same verse as lookism l, Viral Hit and others) while RQ is YLAB (who made Superstring, Bluestring and Red string verses, but it does not seem to be connected to any string so far).