Since the drama received so much love from the people watching it, maybe I went into with too high an expactation. Nevertheless, I'll try to be as objective as possible, despite the fact that this is still a subjective opinion of a person.
Personally, I find the romanticism of most scenes too cheesy and long. It's not because I dislike the type in general as I'm a regular consumer of kdrama and I quite like the time the show gives for the audience to process the emotions. However, the age gap lead to a large portion of the scene being unused because they can't physically do anything to lovey dovey as it's not appropriate. In the end, I didn't find myself emotionally attached and invested into the character.