SME claimed that the three members agreed to this concert back in 2008, implying that the three backed out of their promise with SME and the fans; however, the legal counsel of the three member are claiming that signatures the three members made in the contract for the concert have been signed by someone other than the three members themselves.
The legal counsel says that they have acquired the hand-written statement of a person who claims to have signed the contract without consent of the three members. Apparently in the music industry, when artists are busy the company usually just notifies them of their future schedule and then signs related document for the artists.
Most of the time, this custom is accepted without any complaints from the artist but it has become a trouble because the three members are not in good terms with SME. Legal counsel argues that they were not informed of concert in Shenzen and found out about it during the course of preparation for lawsuit.