I'll try to explain it PLOT MC goes in close door training not caring about worldly affairs after a time skip BOOM now MC is OP similar to The Simple-Looking Sword Saint is Nevertheless the Strongest
yeah he's right, almost every chinese system based cultivation novel have OP MC or atleast strong enough to fight against higher rank being.
The Principle of a Philosopher by Eternal Fool “Asley” That Person. Later on… (Not sure about this, didn't read it myself) 400 Years Old Virgin Demon King
Ignore the ones you know: To Be a Power in the Shadows! Stop, Friendly Fire! Konjiki no Moji Tsukai The Tutorial Is Too Hard Everyone Else is a Returnee