The court didn't issue a subpoena, just a short message. Can you not go?

Legal analysis: you must go to court. If you don't go, the court will judge by default.

Legal basis: Article 144 of the Civil Procedure Law of People's Republic of China (PRC). If the defendant refuses to appear in court without justifiable reasons after being summoned by a summons, or withdraws from court halfway without the permission of the court, he may make a judgment by default.

Article 261 of the Interpretation of the Supreme People's Court on the Application of the Civil Procedure Law of People's Republic of China (PRC) is applicable to the trial of a case by summary procedure. The people's court may summon the parties, notify the witnesses and serve litigation documents other than the judgment documents by means of telegram, telephone, short message, fax and e-mail.