- Series: KO One
- Episode No. 04
- Chinese: 第四集
- Original Airdate December 17, 2005
- Previous Episode: Episode 3
- Next Episode: Episode 5
The class find out that Lei Ke Si has gone poor and is working in a pub where he is abused by his superiors. They all decide to help get him out. However, Ya Se suspects something strange from Lei Ke Si and decides to go on a private investigation afterward.
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