Shen Yanzhi returned to Beijing with a secret letter to overturn the case for his father and brother. When he met Su Muyan, he discovered that he was a Jin Yiwei and that his father had also been wronged for the same crime. The two formed an alliance to find out the truth together. On a cold night, a man in black infiltrates, and Su Muyan takes action to capture him. The road ahead is rife with dangers, and the fate of the two becomes even more closely linked.
