The mobile teams led by Sen (Simon Yam) and May (Maggie Shiu) are competitive. May's team is appreciated by Chief Ho and is spoiled and arrogant. Sen's team is dissatisfied but can do nothing about it. The mobile team is about to disband, but a robbery occurs on the last day of duty and the robbers flee into the deserted mountains. The two teams are combined into one team to conduct a carpet search on the mountain. During this period, various bizarre situations continued, coupled with many contradictions between them, causing Sen and May to act separately, but encountered many obstacles. On the other hand, Fei Tong (Lin Xue), who was delivering meals to the team members, had a car breakdown and was encountered by robbers. The officers and soldiers started a weird and thrilling game of hide-and-seek with the robbers in the mountains, and the friendship between PTU colleagues was also tested...