Since 2021, So has established the SoFlute YouTube Channel, dedicated to promoting the development of flute music in Hong Kong. He is currently the most popular flute YouTuber in Hong Kong in terms of video views,subscriptions and number of video.
Mario So, graduated from The Education University of Hong Kong and Baptist University. He started learning flute with his father So Kam Tong at the age of seven, studying under Dr. LAM Wing Cheong, Linda Stuckey, and Matthew Wu. He has performed with several renowned flutists, including Peter Lukas Graf, Vincent Lucas, and Philippe Pierlot. So is currently the Principal Piccolo of the Hong Kong Strings.
To promote local jazz music, he founded the Hong Kong Pop Jazz Band in 2004 and serves as the musical director.
So has also been involved in local advertising, recording, and concert productions multiple times, collaborating with singers such as William So, Denise Ho, Charmaine Fong, Janice Vidal, and Justin Lo.