Excuse me, what is the movie Swallowtail Butterfly about?

In the heyday of the economy, a large number of foreign immigrants poured into Japan, and they regarded Japan as a gold rush paradise, and named it "Du Yuan". But the Japanese hate this name and call these immigrants "Yuan thieves".

After her mother died, an unknown girl named "Du Yuan" was sent to the prostitute Gu Liguo. The kind-hearted Guliguo took the girl in temporarily and named her Papilio according to the butterfly tattooed on her chest.

One day, Guliguo took Papilio to a waste resettlement area and garage called "Empty". There, Butterfly met Huo, Aaron, Lang Lang and others, all of whom were "Yuan thieves" from different countries. Soon, the butterflies who often go to the "blue sky" to help became familiar with them and became bosom friends. One night, a guest of Guliguo tried to rape a butterfly. Aaron, who heard the news, accidentally killed this man. When disposing of the body, everyone was surprised to find that there was a tape hidden in the man's stomach, which recorded the American song "My Way".

Lang Lang's real identity is a killer of a secret organization. He learned through his partner Chun Mei that the person killed by Aaron was a member of the underworld Sudo, and the magnetic induction data for making counterfeit money was hidden in that tape. People use this tape to copy a lot of counterfeit money and get rich overnight. Aaron and others returned to China after making a fortune, while Hong Fei left the "blue sky" and bought a nightclub in the city, turning it into a live broadcast room dedicated to Guliguo singing. Soon, Gu Liguo signed a record company because of his excellent singing talent. Under the interference of the company, the famous solid fruit had to break off relations with these "yuan thieves"

At the same time, the owner of the tape, underworld leader Liu Liangkui, learned of the whereabouts of the tape and sent people to hunt down Gu and others. Hong Fei, who was at large, was arrested by the police for using counterfeit money and died in prison after being tortured. Guliguo was hijacked by Liu Liangkui's men and rushed to the "blue sky" to get the tape. With the help of Chun Mei, Lang Lang killed these gangsters tactfully. After a storm, people returned to the "blue sky" and bid farewell to Hong Fei in the form of cremation. Sad butterflies also burned boxes of banknotes.

Finally, Butterfly returned the tape to Liu Liangkui, who met by chance, and told him that Guliguo was his long-lost sister.