They definitely exaggerated the cast's real height. The synopsis is a bit wrong since it wasn't much about romance, maybe very slight romantic tension.
A very typical trajectory for the subject it handles from start to end just like most of Korean media that touch on the subject, it didn't attempt to do anything different in the slightest. If they had more creative freedom in a special then they should've better utilized their resources. Anyway, it's still an okay watch.