 He was injected with poisonous amounts of drugs which led to paralysis by Michael So in episode 15, but he completely recovers and resumes police office work in episode 29.Bella Lam portrays Lam Po-tim (林寶甜), known as Bubble, an undercover trainee mentored by Laughing.Ronald Law portrays Kwok Ting-tin (郭定天), known as T Two, an UC trainee mentored by Madam Jo.