The protagonist Ye Yun (or other names) wakes up and becomes the biological brother of Ye Gucheng, the "Lord of Baiyun City". Living on the Feixian Island in the South China Sea, he showed an astonishing talent in swordsmanship. He was able to discern the sword intention of the "Flying Immortal from Heaven" at the age of twelve, and was regarded by Ye Gucheng as another peerless sword in the future of Baiyun City. However, Ye Yun is very playful and is tired of the boring practice on the island. He longs for the wonderful world where Lu Xiaofeng, the buildings full of flowers, fine wines and strange cases, as mentioned by his brother. When he was sixteen years old, he left a letter, took only a sword, secretly left the island, and officially entered the Central Plains.
