There will be no illegal record. There is a record of the impact of the law: 1 according to your account of the situation, your friend was the public security organs in accordance with the general procedures for punishment, the punishment of some of the relevant evidence, materials, transcripts, penalty decision will be bound into a public security case file by the public security organs archives, the general retention of such files for a long period of time. 2. the public security of the lawbreaker's punishment, according to the current relevant public security procedures In accordance with the relevant public security procedures in force, the decision on punishment is announced to the offender and signed by the victim and then delivered only to the victim. If the penalty is detention will be notified to the family of the punished person. 3. If your friend's work unit is a government agency, the Public Prosecutor's Office, law enforcement agencies, the army, and some departments that require political examination. This will have a certain impact on your friend.
But you do not have this problem, there is generally no illegal record.