Well, this is my favorite BL but that doesn't mean it was perfect.
Theory of Love wasn't a bad drama in my opinion, but now that it has been a long time since I've finished it, I remember a lot of things that weren't good at all. I will not only talk about the bad things tho, I will stand out what I hated the most and my favorite things.
First of all, Third was way too dramatic, always crying under the shower, I now find those scenes to be really funny because I really can't take them serious since they didn't look credible at all. One of the things that I loved the most about this show was the boys's friendship, even if it was damaged in so many moments, they were always there for each other and I find it very endearing. I'm very happy with the ending and I loved the whole film concept. And last thing was Kai's development, wow, that is something everyone has to watch !