It’s hard to write reviews about shows you love, Thats why I’ll keep it short:

What did I like about the show?
- amazing cinematography (reality & book illustrations)
- an extraordinary Cast (the casting director deserves a big raise)
- lovely characters (especially Sang Tae & Dr. Oh)
- versatile characters and their coping with own past
- well introduced patient stories
- acceptance of mental diseases
- a convincing healing story
- an exciting thriller aspect (let me speculate a lot)
- the unpatriotic dealing & respect for Korean War veterans
- the critics on society
- the symbolism of the show
- the call for acceptance
- the bonding of the brothers (the intense showdown gave me goosebumps & tears)
- perfect mix of humor, tragedy, family story, healing story & thriller
- the morals of each story inside the story
- the bonding of all characters (especially the brothers)
- the fact that you couldn’t dislike any character at all (in my case even the bad person)
- the music
- the conversations
- the slowly blooming love story
- the symbosis of a strong script & detailed director accomplishments
- the nature scenes
- the fine line between too less and too much (it felt realistic)
- the feeling to be completely satisfied after finishing each episode

What did I dislike about the show?
- nothing (that’s why I needed to rate 10/10)
- the feeling that I reached the peek of KDramaland of 2020 (it’s a strong year - who am I kidding?)

I can recommend the show whole heartily.

[MY ADVICE - SPOILER WARNING]
If you have issues with the fl think about her experiences in her most important years. Don’t believe the diagnosis of the talking people. It’s their assumption and not a medical fact. Try to understand the reasons for acting the way they do of every character and enjoy the mystical ride! Have fun, dear! ;)