Both of the leads are sooo pretty and they had great chemistry. Plus their acting was beautiful and i almost cried at the end, which rarely happens with any kind of series to me.
I think the story was crafted really well and there could be potential for a second season, since the ending suggests future relationship development. Also i have to mention the quality of all the scenes, the camera placement, e.c., which i don't see a lot in BL series. The script was great too, there wasn't any awkwardness or uncomfortable silences and i guess you could say this is one of the best series I have ever seen.