An accident 10 years ago left a group of children's relatives missing to this day.
A mysterious circus has become the best shelter for these helpless children. The gentle young magician Nan Xingnuo and his sister Nan Xingna who is good at puppetry, the mysterious animal trainer Lu Chen who knows how to communicate with animals, the twin sisters Ying Xia and Ying Qiu with completely different personalities, and the black acrobat Sejo, were all taken in by Natasha, the leader of the 7sins circus. Xingnuo accidentally obtained the item left behind by his father before he disappeared - a notebook, but it only recorded some fragmentary words. The only word that could be spelled out was the name of the circus, 7sins, the Seven Deadly Sins. During the adventure of traveling around the country, his father's scattered notes gradually brought the ups and downs to the surface. Little did he know that the danger was quietly approaching, and what kind of relationship the members of the circus had...