Zhang San's behavior belongs to infringement. A lawsuit brought for infringement is under the jurisdiction of the court in the place where the infringement occurred or the defendant's domicile, so both courts in this case have jurisdiction.

Because there is jurisdiction, the case is filed first, so the transfer is wrong.

Not correct. If the transferred people's court considers that the transferred case does not belong to its own jurisdiction according to the regulations, it shall report to the people's court at a higher level for designated jurisdiction and shall not transfer it by itself.

Attachment: People's Republic of China (PRC) Civil Procedure Law

Article 35? Where two or more people's courts have jurisdiction over a lawsuit, the plaintiff may bring a suit in one of the people's courts; If the plaintiff brings a lawsuit to two or more people's courts with jurisdiction, it shall be under the jurisdiction of the people's court that filed the case first.

Article 36? If the people's court finds that the accepted case is not under its jurisdiction, it shall transfer it to the people's court with jurisdiction, and the transferred people's court shall accept it. If the transferred people's court considers that the transferred case does not belong to its own jurisdiction according to the regulations, it shall report to the people's court at a higher level for designated jurisdiction and shall not transfer it by itself.