Many logical errors.

Episode 1 - Gunshot wound from a pistol AT close range will be SMALL and what he was shown was like he was shot with a shotgun.
Why did they have to die? It's acceptable that they got busted but it's not north korea.. you will be disciplined thats all.. why suicide?
Goo hyung was very calm and composed when he found out Gyu Wool, a stranger was in his house!

A BIG MISTAKE as most SCI-FI drama would do about blood and microscope, YOU CAN'T VIEW BLOOD ON MICROSCOPE JUST LIKE THAT!!!
you have to make a THIN FILM and cover it with a slip to VIEW!
ALSO, YOU CAN'T FIND BLOOD GROUP IN MICROSCOPE!!! IT'S DONE ON A GALSS SLIDE WITH COAGULANTS!!!
YOU CAN'T CREATE "CURE FOR ALL". JUST LIKE THAT!!
THAT'S WOULVORINE LIKE REGENERATION!!!
even if that was possible, The Bullet will be stuck inside his chest!!! So it will CAUSE WOUND AGAIN!


Always! DIRECTOR'S ARE MAKING BIG MISTAKES WHEN IT COMES TO BIOLOGY! IT'S SO BASIC! DO SOME RESEARCH BEFORE DIRECTING!

ALSO, THERE IS NO SUSPENSE AT ALL! NOW WE KNOW, THAT YOO JIN IS ALIVE AND SHE IS THE MAFIA HEAD.