Fuyu no Sonata: Joshou - Hatsuyuki no Negai
English name: Winter Sonata Prologue: The First Snow Wish
Genres: Drama, Romance
Type: Special, Episodes: 1
Aired: Oct 17, 2009
Studio: Studio Comet, KeyEast, REALTHING
Source: Other
Rating: PG-13 - Teens 13 or older
Synopsis:
Based on the Korean drama television series about the love between two childhood friends and the tragic events that happen.

In terms of the timeline of the Winter Sonata series, it belongs in the time gap midway through episode 21.

(Source: Frostii Subs)