A timid police officer who prefers playing in the police band over active duty. He reluctantly makes a dying promise to avenge his partner but initially forgets it until haunted by the partner's ghost, which ultimately forces him to overcome his cowardice.
Tuba undergoes an internal transformation from cowardice to courage.
Tuba identifies more with the police band than active duty.
Tuba and Joanne share a developing romantic connection.
Tuba and Cheung are assigned as police partners for field operations.
Chow serves as Tuba's decorated superior and operational commander.
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