Your real salary is paid in pieces: a low 'official' salary on the Chinese contract, plus a 'non-compete fee', plus an offshore service agreement. Only the small on-paper number is your legal salary — which silently cuts your social insurance, severance and tax basis.
Ask what number appears on the employment contract versus total take-home. If they differ, ask which base is used for social insurance and severance.
¥16,000 total, but the legal Chinese salary is only ¥4,000.