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[Real 2PM] First concert backstage 2

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2PM Official website: http://2pm.jype.com/

2PM Official fan community: http:...

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Sam Tsui singing a mashup of "Firework" by Katy Perry, "Grenade" by Bruno Mars, and some "D...

*Check out our latest video here: https://www.youtube.com/wat...

Hope you guys like this duet between Christina Grimmie and Sam Tsui...