Three sworn brothers, Yu Hao (Dylan Kuo), Shan Zi (Blue Lan), and Yang Xiong Qi (Michael Zhang), that are delinquents, grew up together fighting local neighborhood rivals. Although they are not triad gangs, they make enemies with them when they offend some of their members. Yu Hao who is considred the leader of the three falls for good girl Xiao Yan Zi (Ady An). Yan Zi comes from a well to do family and has been taking piano lessons since she was young hoping to become a pianist. Yan Zi runs into a bloodied Yu Hao in the streets and saves him. Yu Hao who has always been in love with Yan Zi uses this chance encounter between the two to break the ice and chase after Yan Zi. But the three sworn brothers end up joining triad gangs when they have to protect Yan Zi.

The Outsiders (Traditional Chinese: 鬥魚, Pinyin: Dou Yu), the Chinese title literately translate as "Fighting Fish", is a 2004 romance and action Taiwanese drama starring then newcomers Dylan Kuo, Ady An, Blue Lan and Michael Zhang. The drama is often refereed to as the Taiwan version of the popular Hong Kong film series "Young and Dangerous" based on triad gangs . The drama is Dylan Kuo's first lead role, before then he was a popular model who only had bit cameo roles in dramas. The drama began airing on channel GTV on April 4, 2004 on Sunday nights at 9:00 PM. It finished airing on August 22, 2004 with 20 episodes total. A sequel "The Outsiders II" 鬥魚2 was produced and aired later in 2004 due high ratings of the first series.