I never wrote a review for this series, because back then when it aired, almost everyone hated on it, and so I didn't visit this site anymore. All the negativity got to me.
So let's talk about the elephant in the room: the plot involves cheating. That's a red flag for most people, because it destroys the idea of pure and everlasting love. I only care about a good story. A believable story. A story that feels real where you can connect with the characters. I don't care about cheesy fairy-tales. I don't even care about a sad end.
The thing is, that this series was rather mature compared to other BL series out there. Some parts of the plot were rather silly, but the way they portrayed the emotions were really great. There was sadness, desperation, regret, love. Everyone (Yihwa and Cho included) did a great job. I wasn't really a fan of the "villain", but the whole series was extremely intense. I can recommend it to people who are tired of the cheesy school-boys BL.
Max and Tul are the kings of the BL genre. The most "badass" couple how Tul once said in an interview. The chemistry is mind-blowing. That alone makes this series worth watching. Even though they weren't lovey-dovey (they had trouble in their relationship after all), a simple kiss on the shoulder could melt my heart.