The acting of every actor is top-notch. Nam Yoon Su's portrayal of his character is particularly remarkable. HE WAS NOT ACTING ,HE OWNED THE CHARACTER...
HATS OFF TO HIM TO CHOOSE SUCH A DARING CHARACTER..

Visuals are stunning.

Cinematography is definitely top-tier.

The story is very deep, emotional , thinkable.
Story becomes more n more interesting as episodes progresses.

Climax very beautiful.