Here's a complete collection of when Britney Spears went to South Korea and sang at a show with BoA Kwon (although sadly they each sang their own songs rather than singing any together). The show was on 26th December 2006.

Also singing in the final video are TVXQ (known as DBSK in South Korea & as Tohoshinki in Japan).

Part 1

Summary:

• Song - I Got That Boom Boom (Britney Spears)
• Song - Rock With U (BoA Kwon)
•  BoA & Britney say hi to each other (BoA gives Britney a present!)

Part 2

Summary:

• Song - a Atlantis Princess (BoA Kwon)
• Song - Me against the Music (Britney Spears)
• Interview with Britney Spears
•  Song - Boys (Britney Spears)
•  Song - I'm a slave for U (Britney Spears)

Part 3

Summary:

• Song - Shine We Are (BoA Kwon)
• Interview with BoA Kwon followed by a look at some of the stuff she's done

Part 4

Summary:

• Song -Valenti (BoA Kwon)
• Song -No. 1 (BoA Kwon)
•  A video diary by Britney Spears of her first trip to South Korea followed by an interview with her

Part 5

Summary:

• Song - Toxic (Britney Spears)
• Song - O Holy Night (by TVXQ/DBSK and BoA Kwon)
• Song - Hug  (by TVXQ/DBSK)