This series doesn't quite hit it out of the park, but, it is DEFINITELY better than average, not just for Korean Sci-Fi, but for ANY Sci Fi. The English dubbed versions I found on free streaming sites were fairly well done, and weren't mis-timed nor did they take you out of the story, which I actually feel in this case was a plus over the subtitled versions I usually prefer. As @movieswatcher stated, the characters were likable (even the villain(s)) in that you could understand their motivations, and not just want to smack the taste out of their mouths. (OK, one dude near the end DID cause me to yell "just pop a cap in this MF'ers face already!" at the screen.) Some of the characters actions were puzzling at times, when there seemed to be another choice that could have been made, especially given the circumstances of a very specific threat they faced. And the big plot "twist" at the end felt quite random, and, while interesting, seemed unnecessary, but, it kinda sorta opened it up for one more go round if Netflix likes the viewing numbers, especially if a particular ability has been passed on to the female lead. (Song-Jaaaan....., you gots some splaining' to do girlfriend...)

As myself and others have stated, ignore the hype-beast, sit back, and watch an very enjoyable series.