Character information from TVB.com - translated by Kat - please credit if posting on other sites

Official Site: The Four @ TVB.com
Number of Episodes: 25
Year: September 2008 (Broadcast)
Role: Mo Ching / Sing Ngai Yu
Age: 20-something

Characteristics: Extremely smart, expert at analysing things objectively. But he is arrogant and only thinks of himself, thinks other people are inferior. He does what he feels like, doesn’t care about the world around him, except for his teacher Ju Gok Jing Ngor. He investigates cases based on what he likes or dislikes.

Background & Storyline: He was adopted by Ju Gok Jing Ngor when he was young, and his name was changed to Ngai Yu. He believed his parents were killed by bandits, and his legs were disabled by the bandits as well. But being disabled made Mo Ching even stronger. He could not learn qi gong because his body was weak, but he learned about hidden weapons from Ju Gok. This also developed his precision thinking, but because of this, he thinks he is better than others. Ju Gok establishes a police department, Mo Ching naturally becomes a member. However, he did not get along well with the other members of the department: Tiek Sau (Iron Hand), Jui Ming (Chasing Life) and Lang Huet (Cold Blood). For Mo Ching, who is arrogant and is used to working alone, the other members are just a liability. When they kept working together to investigate cases, Mo Ching felt the others’ perseverance, he slowly left his arrogance behind and built brotherly friendships with them.

Mo Ching discovered his teacher Ju Gok is actually working for King Chai (Wong Jiu Cheung) to secretly rebel against the king. Later on, Mo Ching also discovered he is actually the descendant of the Sing family, who is famous for weapons. Years ago, Tiek Sau’s father misunderstood the Sing family. He thought they were going to sell some top secret weapons to the Liu people, so he invaded the Sing family. A young Mo Ching was disabled by Tiek Sau’s older brother, after Ju Gok adopted him he deliberately hide this from Mo Ching. Actually, Ju Gok wanted to infiltrate Cheung’s side to uncover his plans. However, he was mistaken as the one who was going to rebel and was sent to prison. Mo Ching now understands everything, forgets the past and works together with Tiek Sau etc to save Ju Gok.