2AM's Changmin, who's known to have lost a lot of weight during his pre-debut days, exposed his chocolate abs for viewers.

On the March 10th broadcast of SBS' '1000 Song Challenge', Changmin surprised viewers when he revealed, "I recently lost 7 kg in just 12 days."

To this, MC Lee Hwi Jae asked whether or not he has obtained his six pack, to which Changmin responded, "My abs are somewhat complete now."

The singer then confidently lifted his shirt for everyone to see, uncovering a perfect set of chiseled abs.

In related news, this week's episode of '1000 Song Challenge' features Wonder Girls' Yenny, MBLAQ's Seungho, Hwang Min Woo, Park Si Eun, Tahiti's Jisoo, and more.