I cannot but raise my hat in respect to any writer or director who surprises me. Even if I wouldn't be enjoying something much then I get surprised, my mind immediately erases everything else. Well that what obviously happened here. I started seriously hoping to find an Lee Byung Hun film without the word Mature in the genre. I love mature stuff; especially with Lee Byung Hun. I know what you think. Stop right there!! But mature films cannot be recommended to everyone that's why. Anyhow the story kept me on my toes, yes. It started getting slower so I thought they were going to ruin it but the twist was just shocking for me. And I loved it. I wondered why they presented the couples' every day's life in a so detailed way but then I understood when everything fit its place. Not your oh-my-god-how-I-could-have-lived-before-this-film work, but it's definitely worth watching. Watching Lee Byung Hun playing the psycho doesn't surprise me anymore but amazes me all the same. This guy is not your average actor. Lee Min Yeon did a great job here as well. The ending soundtrack grabbed my heart but I couldn't find it anywhere. I don't think I'll watch it again though it's good enough for that.