Cold memories. (Do kyung soo)

Lee Hyun was a smart kid. She separated from her brothers since she was 3 years old. Ever since then, she lived with Baekhyun, her half twin. She met Kyungsoo while playing with Baekhyun. Her life was normal until she was 15 years old. She and her mother was kidnapped by the North Korea. After a few years spending her life there, she finally got escape with her senior and start a new life at Seoul.