You know, not all superheroes have powers and also wear sophisticated gears. Ryu is undoubtedly a superhero - not the marvel or DC comics type tho. He is deaf and dumb, yet he did not let that discourage him from doing his best possible to save his sister with deterioration health condition. He eventually was able to obtain the required amount only to have it stolen - very sad. I really love the plot of this movie, and it promises to be full of suspense as well as twist and turns. 'cause Korean movies are ultimately great at those. I'm definitely going to look it up on the internet and stream it. Nice recommendation @gooddream. Keep 'em coming