I finished watching this for the first time today, in 2019. This drama is certainly dated in many ways. The cinematography frankly isn't very good, there are many visually boring frames & the lighting is just terrible, but this was normal for kdramas before 2014, or so ~. The OST is fine, but the same 2-3 songs are overused a lot.
I'm giving this 10/10, because probably this is the best drama that Hallyu produced up until like June 2013. There are of course a lot of cliches & the first 5-6 episodes are a bit boring, but from the first gender bender moment onward this was quite awesome. Typically I REALLY do not like gender bender, I think this is the second time after the anime movie "Your Name" where I had good time watching this genre. All the couples had great chemistry & the comedy was spot on too. The typical plot devices used in dramas to ruin everything for the characters were only very lightly used, which is very unusual for an older drama. I can get on board with the "main complication" that the plot had. The ending was quite long and satisfying, even the amnesia part was quite amusing. Also it was very nice that there were no annoying love triangles, or pentagons here, not really anyway. Luckily the token love interest director-nim did not have much screen time, or success. The cast was pretty good, even the evil ajumma mother was tolerable.
No kdrama fan should miss this, it's probably a huge contributor to the korean wave & it's worlds better than shows like "My Girl 2005" and "Boys Over Flowers".