
Florentina:
what about Where Your Eyes Linger? It has 3 versions: drama, movie and director's cut.
Good question. As I remember, I watched the original series. The first MDL review (by "LightHouse74") provides a good explanation of the director's cut. Also notable in this case is that the average MDL ratings follow the typical pattern of the subsequents having slightly higher ratings (7.9, 8.1, 8.2), so it's not one of those strange situations in which there's a large and inexplicable disparity.
Where there's a big rating disparity, sometimes I can hypothesise a reason. Example: "Middleman's Love" 6.4 vs. 7.1 for the uncut version, presumably because the series steadily got better after the awful first two episodes, and the first rating reflects all the rate-and-drop folks who never actually watched the whole series).
Unless there's a good reason (e.g. NC scenes which are too spicy for Youtube), I share your annoyance with unnecessary multiple versions. Grrrr.

Florentina:
Utsukushii Kare first season edit version which is basically the uncut one.
I'd not heard about this "special edit" re-release, but the first MDL review is very enthusiastic about it. The original release was so memorably good that it's hard to imagine adding to it, but if I can find the special edit, this is one I'd gladly re-watch.