A hapless bodyguard is fired from his client's son for the death of his clients father. The son is then hunted by assassins who do not want him to inherit his fathers company.

The story is et in 1890s Siam. Siang is a young Muay Thai warrior and rocketry expert who steals back water buffalo taken from poor Isan farmers by unscrupulous cattle riders. He is searching for a man with a tattoo who killed his parents.

"The Unborn" (or "The Mother") is the story of Por (Intira Jaroenpura), a young woman who works as bartender in a popular nightclub. One night, she is brutally beaten by her former drug dealer Ord (Wannakit Sirioput) who throws her to a lake thinking she is dead. The next day she awakes at the hospital, where Dr. Rudee (Aranya Namwong) has been taking care of her after she was miraculously saved from drowning; however, not all are good news, as she is informed that she is also pregnant. As she recovers from her wounds, she begins to have horrible visions of a strange female ghost that seems to be decided to drive her insane. At first she thinks those are hallucinations caused by the shock and the withdrawal from drugs she is experiencing, but soon the visions become more real, and dangerous.

The film revolves around a group of high school and university students during their school break, and the relationships that develop (or don't). Four romantic threads are interwoven in the film's plot. Both Pu (Charlie Trairat) and Mai (Sirachuch Chienthaworn) are in competition for Nana (Ungsumalynn Sirapatsakmetha) while class geek Jo (Ratchu Surachalas) is in love with a popular girl C (Chutima Teepanat). Meanwhile Oh Lek (Focus Jirakul) is wild about Taiwanese pop sensation Didi (Lu Ting Wei), and Hern (Chantawit Thanasewee) is thinking of cheating on his girlfriend Nuan (Thaniya Ummaritchoti) when he meets Japanese tourist Aoi (Sora Aoi).

One dark night, a former native of a rural Thai village, has his men steal the head of the town's Ong Bak (Buddha statue) to win ruthless crime boss Khom Tuan. The locals regard the theft as a catostrophe, and seek a champion to retrieve their lost treasure. They find their man in Ting (Tony Joo) an orphaned youngster raised at the local temple, and schooled by Pra Kru, a kindly monk, in an ancient system of Muay Thai, Nine Body Weapons. Ting travels to the mean streets of Bangkok, where he's forced to compete in illegal street fights, taking on both and foreign opponents to win the head of ONG BAK from the ruthless crime boss.