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The song title is "Heartache" and it features Yunho and Micky from TVXQ! It sounds great, take a listen below and share your thoughts! They'll be performing "Sorry Sorry" and "Why I Like You" on Friday the 13th's (March 13) Music Bank, so watch out for it!
Credit: allkpop.com
Listen to songs on Youtube (See article)
Note: I'll try to get the whole "Sorry Sorry" album up in the downloads section by this weekend.