It's basically a great thrilling movie, when the movie will end you won't know, I mean it will keep you on the edge of your seat and hyped up every minute. How they saved themselves was really good directed. But I'd like to watch a overall movie you know, I know that this kind of movie need more sequels to reveal the truth, but still tho they should have showed the relationship between Yong Nam and his girlfriend how she died or more between Yong Nam and and Eui Joo their past , more about the scientist who put the gas, his feud with the company and so on.... I know in 2hrs it's not possible to show everything but they should have showed briefly.
-- Overall if you want some thriller without any lingering feelings attached and to keep hyped up your weekend then it's perfect to watch and btw the cast only will make you watch it, who need more when you have yoona ! ????