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First's little brother went with his friends to a party late one night and they crashed. First's brother was the only one who died.
Khao, his brother's best friend caused the crash hence First hated him and blamed only him for his brother's death.
Two years later First is a second-year University student and when Khao joins the school and most of all his department he is furious when Khao immediately starts to flirt with him.