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O-Negative
The same group of friends, same blood type and same lover.
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.
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Tata Young
Prim
Manaswee Krittanookul
Foon
Ray MacDonald
Art
Shahkrit Yamnarm
Puen
Sriphan Chunechomboon
Chomphu
Penpak Sirikul
Prim's Mother
Duangdao Jarujinda
Puen's Mother
Songsit Roongnophakunsri
Nid
Duangkamol Limcharoen
Editor
Thamapat Seengamrat
Foon's Father
Thorung Jarungkijanan
Foon's Mother
Praphot Mayura
Puen's Father
