HEI plays mahjong early in the morning. YEE and CHING think there must be something wrong with her. PENG interprets her act is actually expressing her anger at HING for being the helper in a volunteer medical team. Without succeeding in dissuading HING from doing the job, PENG asks him to go hiking together. He wants to prove that HING is physically unfit for the challenging work in Yunnan China. It turns out that HING appears to have burst of energy, while PENG is admitted to hospital after fatigue and fainting...