I recommend this drama to those that have watched way too many kdramas and are now tired of the shallow romances, empty characters and stories that are barely hanging on by a thread, this drama has everything but that. New viewers won't be able to appreciate this drama as much and won't be as forgiving towards certain things that in the end don't really matter, I know from experience because when I first tried to watch this a long time ago I foolishly dropped it.

This drama has the best acting out there. The male lead was absolutely fantastic, all the characters he played were perfectly acted. The female lead was amazing as well, her expressions, her voice and her playful demeanor were perfect for this character, no one else would've been able to play these characters like they did.

The story is rich, emotional, carefully crafted and slowly unveiled to the viewer. There are a lot of twists and turns. The smallest lines and scenes carry significance that is revealed later with a huge emotional impact.
The dialogue is excellent, the conversations sound natural and can really pack a punch at times. Some scenes became memorable because of their beautiful lines that tug at your heartstrings.

The comedy is good, some golden scenes come to mind specifically.

The main characters have actual character development and a character arc, they go through an inner journey over the course of the story and every character has their role, unique personality, goals and motivations even if they are only a side character.
The romance is honestly one of the best if not the best romance. I could really feel their love for each other because it made sense, there were so many reasons for them to love each other so when they ultimately expressed it through dialogue or even through their eyes it was really heartwarming. This is one of those couples that I truly felt belonged together.

Obviously this show, like everything in this world, isn't perfect(its flaws are mainly the cringy visual fx, the sometimes excessive crying, some emotional scenes that are badly timed and the questionable mental ilness aspect that I, to enjoy the series more, saw in a more fantasy-esque light as it was probably intended) but in the end it leaves us feeling full and glad we didn't skip on this one.