Where's Officer Tuba ?

Hung is a policeman, but because of his timid character, he spends his days in the Police Band as a tuba player. Inspector Chiang sees the potential in Hung and arranges him to investigating the case together. Unfortunately, Chiang gets killed at work, but his ghost helps Hung to crackdown on the villains and justice is brought back. Hung even wins his girl with his returned confidence! (official distributor synopsis)