Bi lives with her mother Lai, who works as a prostitute to support them. One day, a drunk client arrives at the boat where they are living while Lai is out shopping and decides to rape Bi rather than wait. Lai returns during the rape and furiously pulls him off her daughter; during their ensuing struggle, Bi's mother is killed by the client and in return, Bi stabs the man to death. However, the boat had been set on fire during their fight, leaving her homeless, and she flees to Ho Chi Minh City that night.After several years of living on the streets in the late 1990s, earning money with odd jobs and pickpocketing, Bi is rescued from an attempted rape and recruited by Jacqueline Hoang (aka "Aunt Lin"), who has trained two other sexual assault survivors, Thanh and Hong, as the "Wild Daisies" vigilante group to protect women. The "Wild Daisies" target gang leader "Mad Dog" Hai, who is notorious for trafficking women and girls to serve in his brothels. Hai, who also manages a casino as his semi-legitimate business, has three principal lieutenants; one serves as a bodyguard ("Half-Blood" Son) and the other two earn money for him by managing an illegal drug trade ("The Dealer" Long) and prostitution ("Scarface" Teo). As the vigilante group bonds while training for, then fighting Hai's gang, they learn that Lin's motives are not as pure-hearted as she said initially: she also is seeking revenge for the murder of her husband and young son, during an attack ordered by Hai that left Lin grievously injured.After Hong is killed during a raid gone bad and their hideout is uncovered, the "Wild Daisies" succeed in bringing Lin to Hai after fighting their way through the casino, with help from a mole inside Hai's organization. After Lin kills Hai, she reveals her husband was a gang leader who was betrayed by Hai, and Lin has been using the "Wild Daisies" to take over Hai's territory; Lin then orders Thanh to execute Bi and shoots Thanh when she refuses. After Bi kills Lin, she falls unconscious and is arrested, spending the next 15 years in prison. Upon her release, she adopts the street name Thanh Sói.