According to your situation. First of all, the question of whether the lawsuit can be successful is brought to the court filing chamber. The plaintiff needs to provide evidence and information about the defendant. It is difficult to judge what information the plaintiff has. However, if the other party has enough information and evidence, the lawsuit can be successful. of. Secondly, if the lawsuit is successful, does your friend use your trademark with your consent? Did you make a profit? This determines whether you are jointly and severally liable.