Cheung Chui San first met Yan So So not long after the latter murdered the entire Dragon's Gate Courier Service to punish them for having failed to deliver Yu Doi Nam to Mt. Mo Dong safely. The problem was that Yan So So had dressed herself in clothing identical to Cheung Chui San's when she committed the murders, leading the Shaolin monks who had gone to protect the Dragon's Gate Courier Service to believe that Cheung Chui San was the murderer.
Why did Yan So So do this? Was she trying to get Cheung Chui San into trouble?