Last month, a TVXQ fan site called DNBN submitted a civil appeal to Korea’s Ministry of Culture, Sports and Tourism charging SM Entertainment with selling tickets to the group’s Nov. 21 Shenzhen, China, concert in late September even though Chinese authorities did not approve the concerts until Oct. 28.

By doing so, SM “publicly disregarded another country’s administrative procedures,” said the complaint, and placed in jeopardy any future cultural exchanges between South Korea and China.

SM quickly denied selling tickets without Chinese permission, but the matter became even more complicated when the three TVXQ members suing SM came out and said their signatures on a “note of confirmation” stating that they would indeed participate in the Shenzhen concert had been forged.

The note was being used at ticket sales locations to show potential ticket buyers that the three singers would show up at the concert.

Apparently, when the three singers initiated their lawsuit they promised to fulfill any concert obligations that had already been made. However, they say that at the time they filed the suit the Shenzhen concert had not been finalized.

A Korean music industry insider told a newspaper that it isn’t uncommon for management agencies to sign their clients’ names “when they are too busy to do it themselves.”