Born and raised in Hong Kong, So has performed in many notable productions including I Have a Date with Spring, The Legend of the Mad Phoenix, Love in a Fallen City, Secret Love in Peach Blossom Land, Rabbit Hole and 18/F Flat C of the HKREP; Between Life and Death, The Shape of Things, An Ordinary Man and The Amahs at HKAF and Superman Forever with W Theatre company. I Have a Date with Spring and The Legend of the Mad Phoenix were both staged in over 100 performances. TV credits include Detective investigation File (I&II), Plain Love II, An Awakening Story, Triumph in the Skies, Men in Pain and Rear Mirror. She has hosted shows including Kitchen Diva Louisa and Lost at the Bottom of the World.
So has won a number of awards and nominations including Best Actress (Tradegy/Drama) for Between Life and Death at the Hong Kong Drama Awards 2003, and Best Supporting Actress (Comedy/Farce) for Noises Off at the Hong Kong Drama Awards 1993. In 2006, she won a Best Actress nomination at the 16th Shanghai Magnolia Stage Performance Awards for her performance in Love in a Fallen City. In 2006/07, she received Top 10 Artistes Awards by Next Media Group and My Favourite Drama Artist (Gold Prize). Her show Kitchen Diva Louisa was named Top 10 TV Programmes by Next Media Group in 2011. In 2009, she was granted the Lee Hysan Foundation Fellowship by Asian Cultural Council to study in the United States.