A group of five teenagers of the same blood-type 'O' become friends at art college. Prim has a crush on bad boy Art, while her friend Foon likes quiet Puen. The five form a band and survive freshman initiation rituals, but conflict erupts when romances break up the group's harmony.
Acting
Shahkrit Yamnarm's brooding intensity—he knows exactly what he's doing.
Costume
Peak 90s Thai fashion: oversized everything, tragic hair choices.
Director
Pinyo Roothum
Trivia, insights & behind the scenes
This was Tata Young's acting debut at 17—she'd become Thailand's biggest pop export within three years.
The 'O-Negative' title plays on Thai beliefs about blood type personality compatibility—Type Os are supposedly natural leaders, which ironically explains this group's total chaos.
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