i bought Nexen 155/65/14 for move, the original specified tyre size back in august 2016, have used it for 33k kms till now from lahore all the way upto murree, nathia gali, abbottabad, thandyani and i havent faced any issues
people here say its chinese but as your mentioned they are korean and they are not as bad as people precieve
a friend used them for like 50k in his move and i think i can clock 17k more on them easily
if you keep your tyre inflated proper they will server you well
any tyre will give up is not taken care off
i bought it from shahrayar traders faisal town for 21 or 22k after adjusting old tyres but back then $ was low compared to today
BTW saif traders rates are usually high