This was not a 'non-stop watching' drama. I even stopped once, for a week, before continuing.

What I liked
-- The male lead character
-- The acting was very good by most of the cast
-- The second female lead and the second couple love story

What I didn't like
-- Too long and slow. It could have been a 16-ep drama by skipping unnecessary side stories.
-- The female lead character, indecisive, whining instead of studying, etc
-- The silly breakup. By this time I was already tired of watching.
-- The lack of communication between the main couple