Young Shui Ge was suddenly killed and his family was wiped out, becoming a "fish that slipped through the net". Under the guidance of an expert, Shui Ge, who "slipped through the net", came to the capital Chang'an to avoid disaster and find a place to settle down. He became brothers in life and death with four young men, Jin, Yin, Tong, and Tie, and called himself a young knight. He also became friends of life and death with Persian boys Sai Ma and Abdu. The five young men wanted to seek a good future, but unexpectedly, they mistakenly entered the home of Wang Yushi, the general backstage of the evil forces in the northwest. They didn't know that Wang Yushi was the culprit who caused Shui Ge to suffer the disaster of extermination. In order to eradicate Shui Ge, the "fish that slipped through the net", Wang Yushi sent the five young men to the northwest border in the name of building meritorious services, intending to use them to rob tribute and then frame them and catch them all. The five young men didn't know it was a trick, and they ran to the "Gate of Hell" with joy. Jin Ge, Abdu and Sai Ma died in the desert one after another. The blood debt must be paid in blood, and Brother Shui's divine wind sword finally came out of the sheath in anger. Several brothers upheld justice in the Gobi Desert, blood splashed in the governor's mansion, hunted down Mao Liqiu, took back the tribute, and washed away the charges. The anger of revenge and evil burned from Guazhou all the way to the capital Chang'an.