I'm just an average moviegoer and I saw this with English subtitles. I can't understand Korean, and English subtitles always take away something from the movie. The experience is not as organic and it's hard to concentrate when your attention is divided between reading text and watching the scenes. With that said, let me share what I thought of the movie after watching it for the first time. The movie made me uncomfortable as it should be. The amount of tension and suspense on the screen until the midpoint is just sublime. As a disaster flick, it didn't really immerse me in the sense of danger and fear. I'm not fond of the route that the movie took to reach its ending. It didn't leave an impression. What I do love about this movie is the main cast. I admired their works for years. I wish the role of Im Si-wan was extended because I can't get enough of him.