It's a around 5 minutes of video to say 'Thank you' to all the fans of Someday or one day'.
It shows how whole team gone through many difficulties in making this drama. Despite this fact the amount of support they got from fans in this journey.

I think those who were not happy with last episode ending will enjoy this ending.

Whole team is worth praising. It's not an easy when any drama catch people's attention after scandal. But this drama did that. Whole script, acting was mind blowing. We need such type of drama more..