I watched the interview just then, and saw the bit where zhoumi talked about leehom. You guys misunderstood. He said there was a time he sang for leehom at the back cos (this is the bit you guys missed)
he had already sang with leehom before, and since leehom had problems and his voice sounded similar, he helped leehom sing that extra song. (I bet that was the clip where he sang on stage, but I think he met leehom again or sth cos I think he actually sang for leehom the second time round)
Anyway, think of this logically, why would ZM say that on national tv if it weren't true? He already knows he's hated on (T_T) so I HIGHLY HIGHLY doubt he'll say and do sth like that if it weren't true.
Oh and he DID NOT say he sang for leehom six years ago. He said six years ago, he started entering competitions.
People and antifans need to give him a chance