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OP MC (MALES ONLY) 
 Martial Arts
  Fantasy!
  Reincarnation!
   Second chances! 
 New Life!
  Manhua! 
 Manhwa! 
 Weak To Strong! 
(LITTLE TO NO HAREMS

Isn’t the Asrhan core technique from that other webtoon named “The World’s Best Engineer”
chapter 2 btw

I never noticed Kim Dokja until I reread it