Dr. Bae is the doctor at Choogdong Hospital who assisted Sun in the birthing of her daughter, Ji Yeon Kwon. While he wanted to perform a C-section, Sun refused so that the baby could be born in front of Jin. The baby was born naturally, and Dr. Bae handed her to Sun. ("Ji Yeon")
During casting Dr. Bae was described as "male, early 30s, Korean. Professional and accomplished, a calming presence in times of crisis. Working his regular shift, he gets more than he bargained for. Must be able to speak Korean...Co-star"