What is the metaphor of Qin Gui's "body body double" in "Man Jiang Hong"?

Body double of Qin Gui in Man Jiang Hong is a loyal supporter, protected and supported by Qin Gui. Qin Gui regards itself as a "national". He used his body to protect the "citizens" and exchanged his blood for their freedom. He hopes to win freedom for "citizens" with his life, so as to obtain happiness for them. Qin Gui's body body double can be regarded as a form of loyalty. He traded his life for the freedom of a citizen.