@the king bro what obvious flaws?? Just think abt the whole situation a lil and everything makes sense? The s rank guy has the key probs cuz he's one of the strongest and the keys are separated for safekeeping bc the usual strong hunters wouldn't want to lose the dungeons otherwise what's the use of their power and where would their wealth come from. How the blue hair girl knows??? SHES LITERALLY THE FAMILY HEAD OF THE TOP INFLUENTIAL FAMILIES WITH A WIDE INFO NETWORK?? And weak character?? The s rank had to face a literal demon king that could kill its own creator who we can assume is g** or at least an angel which far surpasses a human being at s rank.