So I will preface this by saying, this was a beautiful drama.

A fairly short series with all things considered, but I really loved it.
The way the greyscale fades to colour fascinated me so much. The overall ambience and OST made this drama so good.
Alot of people have complaints about the acting from Goo Yoo Han's actor, but I personally loved it. He always looked at Choi Yeon Woo like he held the stars.

I will say, if you are considering watching this it really is worth it.
It has hints of mystery and hints of something more sinister but the ending left it open nicely.