Secret Kill Order

During the Wanli period of the Ming Dynasty, the famous general Qi Jiguang was framed by the eunuchs and retired to the forest. Fang Xinjing, a martial arts student, came to the capital to take the martial arts examination. He lost his name in Sunshan and was at a loss. Fortunately, he met Yu Chengsuizhong, a wealthy businessman in the capital. Being generous and hospitable, he not only redeemed the famous prostitute Ziyan to help Fang get married, but also paid a large sum of money to invite Fang to Dengzhou to celebrate Qi Ji's birthday. On the way, he suddenly encountered a strongman stealing a birthday gift. Fortunately, a mysterious man killed the thief and rescued him. Then Fang met the knight Li Wuyan and the Jianghu girl Guofeng. The three became close friends and went to Shandong together. However, during a fierce battle with Japanese pirates on the way, Li was accidentally poisoned by an arrow. He was taken care of by Fei Feng, and a secret love arose. The three of them arrived in Dengzhou on the eve of Qi Jiguang's birthday. That night, Qi suddenly died mysteriously. The next day, I was heartbroken to learn that Fang came to wish me a birthday. He parted ways with Li Wuyan in a burst of wind. Fang rushed back to the capital and found that the wealthy businessman Yu Chengzhong had lived in his previous life. Fang was surprised and suspicious, and undercover and covert investigations finally revealed that Yu Chengzhong was a fake of Qi Jiguang's general Yang Siwei. Yang used Fang Mei to send birthday gifts to assassinate Qi Jiguang. However, Qi was killed before he received the birthday gift. It was obvious that the assassin was someone else. Who secretly killed Qi Jiguang?