Bonus Feature and DVD Credits:
On the first disk's "Special Features" menu, go to "Main" and press your Left button. You'll see something that looks like a girl sitting on a bench. Once you press your Enter button, you'll have two choices: "A Letter from Soo-Yeon" and DVD Credits. The letter from Soo-Yeon has voice over with scenes from the movie and behind the scenes footage and stills.
Reported by: Pat Pilon

Behind the Scenes:
On disk 2, go inside the "To the Viewer" menu screen. Go to "Main" and press your Left button. There should be a picture that looks some think like a girl sitting on a bench. This is a 4 1/2-minute message from one of the sisters (from the younger to the older), and also contains behind the scenes footage and movie stills.
Reported by: Pat Pilon