If you watched Wet Dreams (2005) and enjoyed it, this movie is definitely NOT for you. The plot may seem similar (student falls for PE teacher), but the take is total opposite. No rom-com, laughter, stupid little gags, farts and dumb teenage girls here. No butterflies and bubbly dialogues. Welcome to the dark side!!! I was glad to see some fine acting from Jo Bo Ah, nothing like her performance in Shut Up: Flower Boy Band. Looks like she is maturing as an actress and I look forward to her next movies. She took a serious challenge with this role and I must confess I was worried she might not have what it takes YET to pull it off. But she did! And her chemistry with Jang Hyuk was beyond my wildest expectations, more so as their age gap IRL is 15 years and he is such a sunbae to her!!! They are both smoking hot and manage to suck the viewer into the story and keep him holding his breath most of the time. Yes, you have some mature content and violent scenes here and there, but nothing gratuitous! Let's face it: you cannot dive into the depths of human mind and soul without getting a bit dirty in the process. Lust, obsession, betrayal, guilt, revenge are not easy to portrayal, nor digest. So beware! I majored in Psychology (plus my father is a PE teacher LOL), so I liked this movie very much, but it sure won't be everyone's cup of tea. However it's worth watching and you won't get bored for sure.