YG Entertainment trainer shows off the abs of a Big Bang member?

Last week YG Entertainment's official trainer Hwang Ssa Bu updated his me2day with photos from their official gym / work out center in the YG Entertainment HQ Building. Now Hwang Ssa Bu is back with another update. In this update, he writes "Who's this person working so hard?" and he also attached this photo: Some netizens are thinking that it's Big Bang member Taeyang as it's been known that he has chocolate abs. However, there's others who think it could very well be Seung Ri as he showed off his abs in this photo and in the Strong Baby MV. Speaking of Seung Ri, Hwang Ssa Bu also posted this photo of Seung Ri working hard on the treadmill along with 2NE1's CL (?) in what he cleverly calls the YGym: Thanks to dreamadream for the tip.