This is one of those shows where the secondary characters shine so much you forget about the story of the main leads.
This drama has a nice backstory and although it's quite typical and it has been repeated a lot in other dramas and movies, keeps you interested.
I loved the funny moments and the most appealing thing for me was the story and relationship of the two brothers as well as the backstories of all the supporting cast, moving, deep and painful but very beautiful.
Also, what an amazing, refreshing and shocking twist at the end! Didn't expect it and I loved it!!! Well done to the writers!