The love story was implausible piecemeal. Side plots were pursued for a tiringly long time. Also the annoying: "I want to spare my friend suffering, therefore I torture him terribly, but with good intentions", could not be missing, because the end was near.

There was of course a love triangle, so much time must be! The FLs sidekick seemed more important than the ML and had more scenes felt. The FLs in Korea always break the hearts of the greatest men, even when, as here, the FLs are simple-minded, almost dead, moderate-looking, and treat the great men like cab drivers. The glorification of FL was exaggerated to excess, including their professional skills.

FL is not a likable person overall, although she appears that way on the surface. She intentionally ruins ML's life plan, as critical as one may be of his perspective on life. She does not love him very much, as eagerly as she constantly pursues other interests. She is consistently selfish, hiding that behind her countenance of suffering. Rarely is there any reference to the precious time that remains. Wasting her time: she takes a bit of revenge, does nice things too, so what? Why should one also be precious with precious time?
Probably because of the flaws, the series drowns in a stream of tears. And an ending can be so mendacious that it cracks: the people want it, the writers write it.