The 13th episode of the Zhong Ji series.
- Series: KO One
- Episode No. 13
- Chinese: 第十三集
- Original Airdate February 18, 2006
- Previous Episode: Episode 12
- Next Episode: Episode 14
The trio work together to protect everyone from the mysterious villainous force. Xiao Yu breaks his left hand in battle. The team figures out that one of the enemies they encounter is their teacher's supposedly dead little brother, who is also KO 1 - the strongest fighter on the KO Rank.
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