I'm only writing this review because I disagree with some of the reviews labeled most helpful.
Other than the slightly exaggerated narcolepsy (its a very serious issue but idk if the symptoms happen like this) and the unbelievable 30+ love confessions, the story overall is really cute. The acting was great, and like many others, my fave was Sasa (sophisticated, strong, smart, funny, great best friend). I don't really think there were any extremely annoying characters (but ofc there is a protagonist). The OST was pretty fitting. I really like Someday (on Spotify) and Lonely (not on Spotify :/).
The drama was overall funny, light hearted, and cute. Would rewatch mainly to get a few laughs. I don't think the storyline dragged on for too long...28 episodes is a good length. I'm really confused about the draggy/downhill comment (have you seen a 50 episode drama? or even a 35 episode drama that could've been 25?). The ending was good (some cliche parts but leaves an overall complete feeling).