Definitly a 4/5. Better than average for the few character development and "fleshing out" we get, but also not a 5/5 since the writing is ok and the pacing is sometime really confusing. For example, some random scenes the writer seemed to want to include just felt like dreams (because they were so out of character), or when they meet in the street and than meet someone else, again and again... The switch between scenes (time AND place) is confusing.
Hakwonmul