I didn't know what to expect going into this movie but I was still pleasantly surprised. Not only is the approach to the topic of bdsm a really interesting one but also the cast fit their roles super well, in my opinion.
First of all, I generally love Lee Joonyoung as an actor, he's brilliant in so many different roles. Second, Seohyun did an amazing job portraying her character and the development of it.

I've watched this movie so many times just because I really enjoy it and I won't ever get bored of it.

For anyone who cares, here's what I wrote on letterboxd about it last year:

I've actually watched this a few times already and I really like it. I went in with super low expectations because how well can a Korean movie cover the topic of bdsm? Well, it can do a lot better then I thought. It showed a side of bdsm and kink outside of the sexual realm, which is a nice breath of fresh air. Of course, it was still somewhat "family-friendly" but that isn't surprising. I did appreciate the more subtle nature of some of the scenes and some were definitely more overt with their coverage of the topic at hand.