Miss Wonton begins with the arrival of a young Chinese immigrant, Ah Na (Amy Ting), to her new place of work, the Buddha's Happiness in New York. At Buddha's Happiness, she meets other immigrant workers and hears their idiosyncratic dreams of the future. She decides she will do better for herself, and is determined to achieve the American Dream. One day while making a delivery, she stumbles upon an underground world of immigrant women in Grand Central station. This world is called the "Golden Palace". She finds a new friend in Lily - her alter ego. She also meets an American man named, Jack and falls for him. As Ah Na grapples onto the hope of a brighter future, the ghosts of her past soon catch up with her. Will Ah Na achieve her sense of place in the real world or will she be forever lost in the uncertainty of the past?

Ah Shou (Ye Feng), who appears dimwitted, cleverly outwits a street hawker, Ah Mou (Liu Lu Hua), who befriends him and forms an alliance. Together, they orchestrate various schemes: dining without paying, blackmailing the clients of a brothel, and renting a room to unsuspecting girls but tricking them into thinking the place is haunted, causing them to eventually forfeit their rent. Their mischief continues until they encounter Ah Chiao (Sakura Teng), a vibrant and sharp-witted individual who not only thwarts their schemes but becomes an integral part of their operation. The trio continues with their scams until an unfortunate encounter with robbers and police involvement adds a twist to their adventurous endeavours.