On her mother's order, Luk Wai Wai goes to the Shi family to serve her eccentric aunt, Mrs. Shi, but she accidentally witnesses a murder and is almost killed by the murderer, Tam Pak Lam. The murderer, Tam Pak-lam, is almost killed by her. In order to avenge his father's death, Tam Pak-lam sneaks into the Shi family to carry out his murderous plan.
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