Legal analysis: not illegal. Staff members of commercial banks shall not disclose state secrets and business secrets they know during their tenure. Staff of commercial banks shall abide by laws, administrative regulations and other business management provisions, excluding non-profit economic organizations, and need to disclose their part-time jobs to their banks.

Legal basis: Article 27 of the Law of People's Republic of China (PRC) Commercial Bank shall not serve as a director or senior manager of a commercial bank under any of the following circumstances: (1) Being sentenced to punishment for committing crimes of corruption, bribery, embezzlement of property, misappropriation of property or disrupting social and economic order, or being deprived of political rights for committing crimes; (2) Being a director, factory director or manager of a company or enterprise that has gone bankrupt and liquidated due to poor management, and being personally responsible for the bankruptcy of the company or enterprise; (3) Being the legal representative of a company or enterprise whose business license has been revoked due to violation of law, and being personally liable; (four) a large amount of debt owed by an individual has not been paid off at maturity.