Not much popular drama could also deliver deep thinkings and carry society responsibilities. All the visitors' story are reflection of real problems people are facing these days, that makes this drama even more appealing and related. Above those, you could enjoy beyond your expectations' high quality of production, makes you feel like watching movie series in front of TV. Perfect cast, no lousy actings at all, high quality ost, good chemistry between almost every roles. What else can I say, full score for my recently binge watching.