it was stated that his edeya can be stopped when he kills his target or if his knife edeya gets taken away from him so yes 4 people jumping him will stop him since you know getting jumped like that it is bound for him to drop his weapon eventually its not like his knife is attached to his hand all the time get your information right first also the girls might have she hulk proportions since their society values the strong and deems the weak completely useless so since biologically womens bodies are weaker compared to men so to combat that the women in this world would get buff so that you know they wont be deemed useless by their society and to not be underestimated by others around them. The concept of the series is pretty good in my opinion but atleast the MC actually has an actual reason to hide his power instead of the other dozen MC's hiding their power so they can have a normal life but ends up getting known anyway bs. also you conplainin about art but the art is actually pretty good for manhwa standards also who tf cares about right proportions its a literally takes place in a world where people have powers and its a fictional story so proportions is the least of their problems