So did they just skip the dialogue as to his excuse for hiding the ability or was it implied? Dude just excepts it as is?
EDIT: Re-read almost the entire series and forgot they explained it a bit when he meets Kim Woojoong. It's hard to recall that from 60 ch ago though. Back then he only explains that he'd be a target of the fiends for being able to cool the 3rd floor, but it makes more sense he'd be a bigger target for releasing the heros.
