This is truly a wondrous, unique show. It hits the right blend of Korean-style mythology and modern Kdrama production. The story is excellent, although the latter half of the drama suffers a little bit from lack of time. For better or worse, this show is "very Kim Eun Sook" (the writer), meaning that it has a unique concept that relies heavily on your emotional feeling over worldbuilding, which definitely works for a romance-focused series. The OST is spectacular, and of note, Ailee's "I Will Come to You Like the First Snow" is still an emotional power ballad compared to other music in 2021.

However, I have to agree with others who have commented that the main couple feels problematic -- their relationship feels like father-daughter a lot of the time, so it has an unfortunate feeling. This story doesn't work without being a romance, but I feel like it might have been better if the main couple relationship was an actual foster father-foster daughter relationship.

But even if you have reservations about the main couple, it is worth it to overlook it and give this Kdrama a watch!