Check out the patch notes for the v20 Lovely Update here:

[Suggestion] Remove Haste's Cooldown

MapleStory 2 Rep: 795
Posts: 8
in Suggestions and Feedback
Suggestion for thief~ I would love to see Haste's cooldown completely removed.

Haste is an essential skill for all builds, but with its lengthy cooldown, every death is severely punishing. Please consider adding this small quality of life change for us. Thanks!