SHEK has a conflict with ROCKY, a police dog in an operation of arresting illegal immigrants. ROCKY, with humanity, decides to teach him a lesson. SHEK lives with CHUNG, his uncle, a gambler who always pay his debts with the electrical appliances at home. This always gives SHEK a headache. LONG, SHEK'S neighbor, is a nurse who works with a vet, YAN. YAN is passionate to animals. SHAN, LONG's best friend, whose wallet has been snatched and is found by SHEK. SHEK is very much interested in SHAN. WAH, who is SHAN'S boyfriend and a movie playwright, leads a hectic life. SHAN has a harmonious relationship with her family. SHEK, having difficulty to deal with people, applies to transfer to the canine division. SHEK and CHUNG win the Mark Six Lottery but the coupon is unfortunately taken away by DONG-DONG, a dog raised by LONG.

LONG reprimands CHUNG and SHEK for bullying DONG-DONG. DONG DONG is found missing in the next morning. LONG. Suspecting CHUNG & SHEK, LONG reports the case to the police and also posts bills to search for DONG DONG. SHEK succeeds in transferring to the canine division but his assigned dog unexpectedly is ROCKY whose uncooperative attitude worries SHEK. SHAN move to village house living with WAH. On SHEK'S exam day, ROCKY, considering SHEK could help him to find the killer of its ex-owner,, co-operates with SHEK to pass his exam. On its beat, ROCKY, running across DUDU, startles at her beauty but SHEK suspects it is the pet of his ex-girlfriend. SHAN and WAH move to SHEK'S downstairs and become neighbor. WAH has an affair with IVY, SHAN'S enemy, and cheated SHAN. ROCKY, who flies into rage and scares gangsters away gets SHEK into trouble as complaints arise.… ...

SHAN settles down and continues her work. However, IVY has taken the officer position by hook or by crook. SHAN resigns after beating IVY up. When the police escort a suspect to rehearse at his home, he suddenly realizes it is the crime scene for the case of body dissection. The prospective buyer, accompanied by SHAN, is scared off but SHEK takes upon to be her tenant. SHAN appreciates SHEK and moves to the third floor to live with them. On beat with SHEK, ROCKY sees HUIN, the killer, and chases him madly. SHEK can make neither head nor tail of it. ROCKY goes to look for HUIN on its own and let SHEK take the blame again. Running across furious bandits, ROCKY is hurt for saving SHEK whose superior, MAN is dissatisfied with his performance and orders him to be retrained at camp. SHEK thinks MAN is picking on him. New tenants on the second floor are unexpectedly WAH and IVY.… ...

YAN is entangled by his client, MAY but LONG is mistaken by her as being jealous. In the clinic, YAN insistently refuses MAY and LONG tells YAN no longer brings his personal affairs to the office. Seeing LONG putting on a solemn look, YAN teases at her again and LONG is angry. HONG, SHEK'S ex-supervisor, intends to have SHEK and his daughter, MAN, engaged and SHEK knows nothing about it. Observing YAN'S consultation, LONG thinks YAN is only focusing on making money and not caring for the life and death of the animals. YAN feels bad without saying a word. Knowing SHAN'S family is going to visit SHAN, LONG tells SHAN to be ready for it. SHAN begs WAH and SHEK to help her go through this predicament. SHAN takes courage to speak out her intention to separate with WING but is tongue-tied and fails. In the police station, NAM, SHEK'S best friend, knows much about MAN and decides to chase after her.… ...

SHEK finishes repairing SHAN'S music box but sees WAH has already given SHAN a new one. SHEK thinks there would be no further chance of developing with SHAN. However, after SHAN'S encouragement, SHEK pours out his heart to her. On one morning, MAN receives a bunch of roses and mistakenly thinks it is sent by SHEK who takes it for granted that MAN knows the flowers are sent by NAM. SHEK congratulates NAM. ROCKY has fought with a fierce dog and hurts its old wounds. YAN announces ROCKY can no longer be a police dog. SHEK and ROCKY are disappointed. YAN suggests to the owner of a seriously wounded dog to put it to sleep but LONG blames him as cold-blooded. YAN can do nothing but tries his best to save it. After operation, the dog is more painful than before. Seeing the pet dying in pain, LONG finally understands YAN and her own foolishness.