Sergeant Tong is wracked with guilt after he unwittingly kills a young girl whilst capuring a criminal named Cheung. When the girl's sister is later kidnapped in a ploy to get Cheung released, Sergeant Tong vows to find and rescue her before she comes to harm.
Liang Xi Mei (Jack Neo) is finally back! Having retired, Liang Xi Mei spends her time looking after her two obedient grandsons. However, Liang Xi Mei still leads a colorful life thanks to her absent-minded BFF Guang Dong Po (Wang Lei), who frequently muddles things up, leaving Liang Xi Mei to resolve the mess; and Lion King (Henry Thia) who is now diagnosed with mild Alzheimer’s, causing confusion and frustrations for everyone. Robert (Mark Lee), Liang Xi Mei’s eldest son also adds to her woes. Robert is a dreamer who often schemes to get rich quick. This causes Liang Xi Mei to find him unreliable and puts all her hopes on her youngest son Albert (Benjamin Josiah Tan). Her favoritism stirs up jealousy within Robert, who vows to strike it rich to win back Liang Xi Mei’s approval.
Hornet (played by Jay Shih) and Mark (played by Nadow) decide to end their careers as assassins with a final mission. Along the way, they meet their former classmate, Sha Bao (played by Gadrick Chin), a drug lord's god-daughter Talia (played by Amber An), and her friend Ira (played by Apple Chan) from the Philippines. Things get complicated as they are each hunted by their own enemies. Action ramps up as they begin their hilarious adventure in Taiwan.
