Responses
I have to disagree with him being OP from the start. He have survival skills due to him coming back from the military plus the past memories of his brother. If you read back from the where he entered. He even can't dodge some knives flying to him thus he repeat it many times and acquired some skills along the way. Using the memories of his deceased brother, he knows which places to go and what items should obtain. And being cunning is an add-on to that. :)
Its like a combination of Tower Of God and Solo Leveling but the difference is that the MC here is OP asf already from the beginning and he keeps getting stronger. While TOG and SL's MCs came from being weak to strong. Welp those manhwas are great tho. I also like this one. ヾ(❀╹◡╹)ﾉ~