### Instruction: What K-pop group did Kang Se-jung sing for?
### Input: Kang Se-jung (born January 15, 1982) is a South Korean actress. She made her entertainment debut as a singer for the K-pop girl group Papaya in 2000; the group released two albums before disbanding in 2001. Kang began acting full-time in 2004, and has appeared in television series such as Assorted Gems (2009) and Heartless City (2013). Upon turning to acting, she used the stage name Go Na-eun before reverting to use of her birth name in 2017.
### Response: Papaya