One is the conflict of interest of dual agency, that is, representing both parties at the same time in the same case.
The subject of this conflict of interest is one or more lawyers practicing in the same law firm. For example, in a civil case, lawyer A acts as the agent of the plaintiff and the agent of the defendant, or lawyer A and lawyer B practice in the same law firm. In civil cases, lawyer A acts as the plaintiff's agent and lawyer B acts as the defendant's agent.
Second, there is a conflict of interest between * * * and the agent, that is, in a criminal case in which * * * commits the same crime, one defender defends more than two co-defendants at the same time.
This conflict of interest only exists in criminal cases, but in administrative and civil cases, the same lawyer can be entrusted as the same agent by multiple plaintiffs or defendants in the same case.
Third, persistent agency conflicts of interest, that is, the same lawyer may not act as a relative agent of a former client with conflicts of interest without the consent of the former client.
This conflict of interest is different from the first two. The first two conflicts of interest exist in the same litigation procedure of the same case, and this conflict of interest is based on different litigation procedures of the same case. For example, in a civil case, lawyer A acted as the plaintiff's agent in the first instance, and the plaintiff did not continue to entrust lawyer A as the agent in the second instance, but lawyer A accepted the defendant's entrustment as the agent in the second instance.
What you said should be the second or third case. If it is a criminal case, the lawyer's behavior is not allowed. If it is an administrative or civil case, it is possible in principle.
If there is a conflict of interest between the original client and other defendants, it depends on the specific situation. You can apply to the court for lawyer withdrawal, and the final result can only be decided by the court, because this situation is not prohibited by law.