Who is Party Secretary Li Guoha from Death of a Red Heroine and what is their importance?

Secretary Li is Chen's mentor. He is a very skilled politician who is able to manipulate most situations to the outcome he desires. Li is a loyal Party member and acts, wherever possible, in the best interests of the Party. Li is instrumental in bringing the case to a close, enabling Chen to act unrestrained by temporarily transferring him to another department. He then ensures Chen and his team are shielded from retribution by manipulating the arrest and probably the trial. Li uses his influence to protect Chen because he sees in Chen a man who will benefit the interests of the Party.