Girl Gang Malaeng Sa

Takkataen (or Taen) grew up in a family of police officers—both her father and her brother, Thana, are on the force. Taen is tough, hates being taken advantage of, and never hesitates to fight back against bullies. Because of her aggressive nature, others view her as a delinquent, and she has no close friends besides her brother.
During her first year of university, Taen saves Namphueng (Phueng), a student working part-time in the cafeteria, from being bullied. Phueng is known for her own feisty attitude and is initially annoyed by Taen’s interference. Both girls remain outcasts at school because their hardened exteriors keep others at a distance.

The Formation of the Gang

One night, Taen and Phueng rescue a fellow student, Malaengpo (Po), who was being drugged by men at a club. Po reveals she was drinking to spite her neglectful parents. She explains that the men belong to the "Luk Mu Gang" (Piglet Gang), a criminal group that preys on female teenagers, forcing them into gambling, prostitution, and drug use.
Taen wants to take them down, but her father and brother can't act without evidence or victim testimony. After the gang attacks Taen and Phueng in retaliation, Thana decides to seriously train Taen in self-defense, inviting Phueng and Po to join. While Phueng falls for Thana at first sight, Thana is initially drawn to the gentler Po, causing Phueng to hide her feelings.
Taen and Phueng become highly skilled, while Po struggles with the physical training but excels at gathering information. The three girls form a secret vigilante group:

• Taen: The brilliant leader and strategist.
• Phueng: The hot-headed "muscle" of the group.
• Po: The scout who identifies victims and gathers intel.

Fighting Injustice

The trio successfully disrupts the gang's operations and leads the police to their illegal gambling dens. Despite their good deeds, the university still views them as troublemakers, and the victims they save are too scared to speak up for them. Undeterred, the girls continue their mission.
The Luk Mu Gang, having lost significant profits, decides to eliminate them by targeting Po, the weakest member. Phueng takes a bullet in the arm to protect Po. During her recovery at Taen’s house, Thana’s constant care causes his feelings to shift toward Phueng.
Eventually, Taen confesses their secret activities to her father and brother. Though they scold the girls for the danger, they are secretly proud. In a final showdown, the police—aided by the girls—raid the gang's hideout and arrest the entire syndicate. Po’s parents finally realize their mistakes and give her the attention she needs, and Thana realizes his love for Phueng.
Though they promised their families they would stop their risky behavior, the emergence of a new criminal gang forces the three girls to reunite once more to fight for justice.