Nan-Yang Pass, performed by Hsiao Hsi Yuan Puppet Theater, is the first part of The Romance of Suei and Tang. The story depicts Emperor Yang Guang, the second emperor of the Suei Dynasty, as a dissolute tyrant who acts against morality by killing his father and brothers, abusing his mother, and taking his brother's wife. Yu-wen Hua, an evil court official unduly favored by the emperor, and his son, are feared by all. Soon after Sui Emperor Yang ascends the throne, Wu Jian-zhang, the imperial tutor, berates him in the court, resulting in the execution of his whole family. Yu-wen Hua, fearing that Wu Yun-zhao, Son of Kong Wu and Lord of Nanyang, are plotting a rebellion, secretly decides to kill the family. He then names Han Qin-hu, an old general, as the commander to launch the attack against Nanyan and his son Yu-wen Cheng as Heaven's Treasure Invincible General who supervises the troops. Han Qin-hu, however, secretly assists Wu Yun-zhao and sends Yu-wen Cheng to supervise the delivery of military supplies. The Suei troops are soon defeated.

The Romance of Suei and Tang of Hsiao Hsi Yuan Puppet Theater consists of 40 parts. In 2002, the puppet theater was invited by ETTV to record TV shows. Starting with The Nan-Yang Pass—Part 1 in which the loyal officials, Wu Jian-zhang and Wu Yun-zhao, are mistakenly killed, The Romance of Suei and Tang is performed in 40 parts, ending with The Unification of the World.