The film revolves around iconic musician Trịnh Công Sơn and the muses that have come and gone in his life, from his passionate youth in the 1960s to his later middle-aged 1990s.

Trịnh Công Sơn's youth, as a young romantic on his way to become one of the greatest songwriters about love and sorrow. Originally set to be a paired release alongside "Em and Trinh."

B4S will begin with a "memorable" night of two groups of close friends at a bar. And then, the audience will be able to follow each person's love story on that "fateful night".

A brutal murder shocks a quiet town. When the mutilated body of a woman is discovered, all suspicion turns toward Sơn — who may have been her lover. Triết, a renowned sculptor, is torn between doubt and brotherly love as he and his wife struggle to prove Sơn’s innocence. In the end, the question remains: is Sơn a killer, a victim of cruel fate, or a lost soul consumed by a love so destructive it leads to his own ruin?