ok so, good news and bad news
the seller sent me the wrong headphone, I got a k702 instead of the Shure which is quite a bit cheaper than the shure one
the good news is that, what I thought is an obvious counterfeit akg is actually a genuine one. the moment I pick it up I told myself it's an low effort fake with cheap plastic comparable to children's toy with a lot of creeky sound
so I look up some reviews and one of them are disassembly video, the guy using his finger knuckle and knock on the k702 plastic housing has the same cheap hollow plastic sound that mine did, another written article review stating stiff headband which is what I have aswell. the driver seems to be the same cloudy yellow membrane found on actual k702
and the part that everyone cares the most, the sounds is surprisingly….. neutral. it's not obnoxiously bassy nor piercing high. it just sounds flat
so I listening it more for couple of days and did some EQ adjustment to suit my taste better. the conclusion is that it is a better headphone than what I have previously owned ( HE400SE ). stock tuning is flat and ( mostly ) not piercing compare to hifiman that likes to copy beyerdynamic's piercing high, better instrument separation, very similar sound stage and a bit worse imaging. the only minor complaints I have is that the fit takes a bit to get used to since it doesn't clamp hard to form tighter seal, and i can notice that theres slight empty void in sound on parts that wasn't covered by the driver in the earcup
overall, I spent 60 USD for open box new k702