Ok, I just finished the series so my opinions and feelings are still very fresh.

First of all I want to point out how great it is the South Korea is starting to open up more into the BL genre. They are constantly making short series and although they have few and short episodes, they are small stepping stones into the fantastic BL world.
That being said, I am somewhat neutral about this story.
Firstly, I loved the cast, the music and the colors, especially the plotline. However, the story isn't finished.
It took about four episodes to get things rolling and there just wasn't enough time in each episode to get things done smoothly. The story was slow and though it would have been perfect for a longer story, this series just didn't have the time for that.
But the biggest issue I have with this is Yeon Woo's missing mother. She was mentioned from the beginning, Yeon Woo was obsessed about seeing her in her blue dress and brown shoes, his aunt was investigating her disappearance and if felt like they were going to find out what happened to her and the other Mono's. But nope. Nothing came from that, there was no conclusion on his mothers issue or what could have happed not to mention the issues that might have come up between her and his father.
The story isn't finished and although I hope there will be another, longer series, I won't hold my breath.
Even with my complaints though, the series is beautiful and the storyline is interesting enough. It won't be one I'll go back and re-watch but I may skim through it once more just for the beauty.