Can a tripartite agreement be reached after paying social security?

Of course. According to Ministry of Human Resources and Social Security official website, signing a labor contract is a direct relationship between employers and workers, and social security payment belongs to the protection of workers' rights and interests. Even if you have paid social security, you can still sign a tripartite agreement with the employer. Social insurance refers to a social and economic system that provides income or compensation for people who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons.