List the television series Kang Se-jung appeared in

Context: Kang Se-jung 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 and Heartless City. Upon turning to acting, she used the stage name Go Na-eun before reverting to use of her birth name in 2017.

Answer: - Assorted Gems
- Heartless City