In the 1970s and 80s, Hong Kong's economy skyrocketed. One product that gained popularity during that era was the automobile, leading to the flourishing automobile repair industry. Against this backdrop, Master Lau Chi-wai, known as the Brainiac Mechanic, embarked on his journey as an automobile mechanic. However, his journey as a mechanic was far from ordinary or smooth. In his twenties, he was introduced to kart racing by a friend. Every weekend, he would be found at the racetrack, fixing and fine-tuning karts. The money he earned from this side gig funded his own participation in races. These dual-role days not only earned him invaluable experience but also a prestigious opportunity to serve as a mechanic for official racing teams during on-road competitions. Unfortunately, after 2000, cars became predominantly electronic, relying heavily on specialised computers for repairs. This shift posed a significant setback for Master Lau. However, during this time, a car owner he had met during his racing days approached him to repair his classic car. Since classic cars primarily rely on mechanical systems, it provided Master Lau with the perfect opportunity to apply the skills and expertise he had acquired over the years on the racetrack. Unexpectedly, he gradually earned the reputation as the go-to 'Master' for classic car owners, breathing new life into their beloved vehicles with his magical touch.