Chong (played by Daniel Wu) and Tong (played by Louis Koo) are identical twins. Chong has lived under the light of his brother Tong since he was a child. Unexpectedly, on Chong's 26th birthday, he received the news of Tong's death. Chong found a key in Tong's belongings and thus entered Tong's world. When Tong met his girlfriend A Lu (played by Gu Zulin), he taught A Lu's former Young and Dangerous boyfriend A Wen (played by Patrick Tam). After A Wen learned about Tong's heavy punches, he found that Tong was born to be a champion in the boxing world, so he became Tong's agent and took Tong to participate in black market boxing competitions. Tong was invincible, and thus he and A Wen became inseparable. A Lu, Tong, and A Wen lived a glorious life. Unexpectedly, Tong was beaten to death by the black boxer invited by the group because he broke the rules of the game of the black market boxing group. A Wen saw the shadow of Tong in Chong again. Under his guidance, Chong trained day and night, eager to defeat the black boxer and avenge Tong...