Helping others to sign and press fingerprints is actually a kind of agency behavior. The consequences will depend on whether the person being helped (i.e. the agent) approves or has authorization for your behavior:

1. If the principal approves your behavior, the principal shall bear legal responsibility and the agent shall not be held liable.

2. If the principal does not approve or does not have the corresponding authorization, the agent shall bear the legal liability arising from the signature.

"General Principles of Civil Law"

Article 63 Citizens and legal persons may perform civil legal acts through agents.

The agent performs civil legal acts in the name of the principal within the scope of agency authority. The principal shall bear civil liability for the agent's acts of agency.

Article 66 If there is no agency power, the agency power is exceeded, or the agency power is terminated, the principal will bear civil liability only after ratification by the principal. For acts that have not been ratified, the perpetrator shall bear civil liability. If I know that another person has committed a civil act in my name without denying it, it shall be deemed to be consent.