Thông tin phim

A news reporting team cover a story in an Anatolian village where many people have seemingly died from pneumonia while a team of scientists try to find a cure. A terrorist group disguised as farmers attack and kill everyone there. Some days later, a former North Korean spy shows up at the South Korean embassy in Istanbul.

Meanwhile, in Hong Kong, Buck Yuen, an exercise equipment salesman, inadvertently foils a bank robbery and becomes a media celebrity. Later that night, a stranger called Manny Liu approaches Yuen and says that he is looking for men of Yuen's age and description on behalf of a terminally ill Korean man, Park Won-jung, who wants to pass his fortune to his long-lost son.

Yuen agrees and follows Liu's associate to South Korea to meet Park in a military hospital. Later, Yuen is approached by Carmen, a reporter, who asks him questions about Park. When Yuen returns to the hospital, he saves Park from a group of thugs and accepts Park's offer to play a "game" – if Yuen wins, he gets everything Park leaves behind for his biological son; if Yuen loses, he will still have fun. Park also gives Yuen a shiny crucifix similar to the one Yuen sees his parents holding in his dreams. After Park's death, Yuen scatters his ashes at his wife's grave and finds a message ("wait for me") engraved on the tombstone. After leaving the cemetery, Yuen and Carmen narrowly evade attacks from thugs. Yuen later realises that "wait for me" corresponds to a phone number of a bank in Istanbul.

In Istanbul, Yuen uses the crucifix, which turns out to be a stamp, to retrieve the contents of Park's safety deposit box. Shortly after leaving the bank, he encounters several robbers trying to steal his briefcase full of money. He holds off the robbers until the police show up and the robbers flee. While touring Istanbul, Yuen meets a mysterious Chinese woman, Yong, who has "wait for me" embroidered on her scarf. When Yuen asks her where she got her scarf, she arranges to meet him at a later date and time.

When Yuen is at a Turkish bath, he gets accosted by a group of thugs demanding that he hands over "the thing". After a long chase through the streets, Yuen finally escapes from them but shows up late for his meeting with Yong. Just then, Carmen and her colleague, Philip, approach Yuen and reveal to him that they are actually CIA agents. The "thing" that everyone is after is a biological weapon, Anthrax II, a more powerful version of anthrax. The weapon had already killed many people in Anatolia, which was chosen as a testing ground. Park developed brain cancer as a result of his involvement in the case. Yuen also learns that Zen, a crime lord, wants to buy the Anthrax II and had sent Yong to get close to Yuen to gather information.

Yuen meets up with Yong, who confirms she is working for Zen. Moments later, they are captured by a group of thugs and brought back to the Anatolian village. As the thugs are beating up Yuen to force him to tell them where the Anthrax II is, mercenaries attack the village and gun down all the thugs. In the ensuing chaos, Yuen escapes with Yong on a makeshift raft. They are picked up by Zen, who reveals that he sent the mercenaries to save them. Yuen also learns that Yong is a drug addict enslaved by Zen. Zen offers Yuen a new deal: more money and Yong's freedom in exchange for the Anthrax II. Although Yuen refuses, Zen still gives him time to find the Anthrax II.

Yuen recalls that there was a Bible in the safety deposit box so he makes his way to a nearby church and meets a priest who knows Park. The priest leads Yuen to the basement where Park temporarily stayed; Yuen finds two vials of Anthrax II there and a note saying "game over". Yuen then reluctantly hands over the Anthrax II to Zen in exchange for Yong. It turns out later that Zen had double-crossed Yuen by giving Yong a fatal dose of drugs. After Yong dies at the train station, Yuen gets arrested and thrown into prison but Carmen and Ashley bail him out. Carmen, feeling sorry for Yong's death, secretly reveals to Yuen that the CIA is meeting Zen the next day to discuss buying the Anthrax II from him.

Yuen takes matters into his own hands and tries to stop Zen at the airport. While Zen and his henchmen flee in a car, Yuen chases them, fights them and manages to get back the Anthrax II. However, the car gets stuck to the rear of a tanker, which soon catches fire. The tanker has to keep moving at a certain speed or else it will explode. After Yuen manages to save the driver and his son, the tanker is heading straight towards the edge of a disused bridge. Just then, Manny Liu appears in a helicopter and tries to pull Yuen out but fails. Yuen leaps from the tanker and grabs hold of the plastic bridge barrier as he swings down. He rolls down a slope, sustains severe injuries from the fall, and becomes unconscious. Liu searches Yuen for the Anthrax II, finds it and leaves.

When Yuen regains consciousness in hospital later, he learns from Liu that his entire adventure was actually a CIA mission arranged to be performed by him as an informal, non-official agent (an "accidental spy"). He was chosen because of his background as an orphan, his sharp intuition and excellent fighting skills. The dream of his parents is actually an illusion created by Liu, who added drugs into Yuen's drink to put him into a hypnotic state.

In a post-credits scene, Yuen, now officially a spy, delivers a briefcase to a drug dealer in Italy and tips off the police to arrest him.

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