I watched this movie on Amazon with my prime account which allowed me to watch for free. 

Scarlet Innocence is a racy korean movie about a Professor who is sent to a small town after being suspended from his post at a university following claims of sexual harassment. He meets Deokee, an innocent and naive 18 year old girl who lives with her mute mother, looking for love and excitement in her boring little town that seems to be made up of an aging population. While the story line has a few unexpected twists, no event was appalling enough to really evoke strong feelings of sympathy towards the characters. I did not get angry with them, I did not feel sad with them, I was not happy with them. While the storyline had several poorly explained occurrences, some that seemed down right impossible, I think if there were stronger actors in the movie with better chemistry, this would have been more enjoyable to watch and receive a higher score from me. I mainly watched because it had some racy scenes which I like, especially in Korean cinema because they are usually well choreographed, but the sex scenes in this movie were just boring to watch and barely arousing. I didn't expect much after I saw the IMDB rating of 5.9, but I was still disappointed. TL;DR I wouldn't recommend watching even if you're bored. Unless you're REALLY bored and you're in the mood for a sub-par revenge story line.