Karsin Bak aka Karsin Berthel is a Hong Kong singer and film actress of Chinese and German descent, most active around the mid-1980s to 1990s.
Bak originally debuted as the lead singer of the band Borderline (邊界樂隊), which won first place at the 1986 Hong Kong Carlsberg Pop Music Festival.
[1] Borderline recorded two LPs before disbanding, with Bak going onto form the band Purple Heart and eventually launching a solo career in 1993.
As a solo artist, she collaborated with Sandy Lam on "I Don't Hate No One" (我沒有恨誰), which was a Cantonese cover version of Wilson Phillips' 1992 single, "You Won't See Me Cry."
Bak studied Fashion Design at the Hong Kong Polytechnic Institute.