In the heart of Chinatown, an ornery, chain-smoking, newly widowed 80-year-old grandma (Tsai Chin) is eager to live life as an independent woman, despite the worry of her family. When a local fortune teller (Wai Ching Ho) predicts a most auspicious day in her future, Grandma decides to head to the casino and goes all in, only to land herself on the wrong side of luck... suddenly attracting the attention of some local gangsters. Desperate to protect herself, Grandma employs the services of a bodyguard (Corey Ha) from a rival gang and soon finds herself right in the middle of a Chinatown gang war.