A beautiful girl who accidentally met a handsome and heart-warming girl. The two became inseparable best friends, but due to the misunderstandings of the people around them, all kinds of sadistic emotional stories happened. It explores youth friendship and the troubles of youth, and also pays attention to young people's attitude and status towards growth and life. The first half is sweet and the second half is sadistic, completely displaying the "core of youth" in front of the audience, showing a different kind of youth and life.

Legend has it that hundreds of years ago, the world was plagued by a scourge – a giant snake with nine heads and a golden body. Often transforming into a woman as beautiful as a celestial fairy, Hydra wreaked havoc on the world and called herself Lady Golden Snake. People were terrified until Master Nan Hua appeared. He defeated the Hydra, beheaded her and trapped her immortal spirit in a divine sword. Hundreds of years later, a mysterious demon broke into the Demonslayer's Hall, where the sword with the Golden Snake's spirit was kept, and stole the sacred relic. The young demoness Qu Ling was tasked with retrieving the sword, but due to her weak spiritual power, she was unable to resist the Golden Serpent and decided to seek the help of Bian Xiaoya, a demon hunter. Together they embark on a journey to retrieve the divine sword and save the world from the Hydra's second coming.

Liu Yidao, who is known as "Ghost Sword" in rivers and lakes, went to visit famous doctors to retreat in order to heal his sister Xiaopiao. The demon clan, headed by Jin Chanzi and Snake Girl, wants to rule the world, and wants to resurrect the black dragon. In order to improve their own cultivation, they constantly endanger the world. Koi "Xiaoyu" strayed into the world and was taken away by the Demon Pavilion. Liu Yidao was rescued in order to collect money, and later learned that the original Xiaoyu was the reincarnation of the black dragon. At this time, the demon tribe also probed the news of Xiaoyu, and wanted to call it the black dragon. In the process of protecting Xiaoyao, Liu Yidao exchanged feelings with each other. Xiaopiao originally did not accept Xiaoya's arrival, and the two slowly became good friends.