Choi Seung-Hi serves as an important character and a part of the central trifecta of promiscuity in Doctor Cha.
Jeong-Suk has been a fiercely devoted and hardworking housewife for twenty years, raising a daughter and a son to be competent, bright, and aspiring individuals.
She has also relentlessly cared for her mother-in-law and her husband’s needs while finessing every minor to major household chores without fuss or complaints.
She has done all of this with complete dedication and love, only to rarely receieve any of it back from her children and especially from his husband, who even gags at the mere touch of her behind her back.
They haven’t had sex even once in the last ten years and it’s all because her husband has been having an extramarital affair with his colleague and his first love, Dr. Seung-Hi.
The old flame
Choi Seung-Hi was In-Ho’s first love. She was his girlfriend when both of them were medical residents at Gusan University Hospital.
Before their relationship could’ve gone anywhere further, a steamy and sudden love-making session between In-Ho and Jeong-Suk changed it all.
When Seung-Hi returned to college, she saw that In-Ho was now supporting Jeong-Suk, who had gotten pregnant with In-Ho’s baby.
Hurt and upset, Seung-Hi departed for America, while In-Ho got married to Jeong-Suk and went on the have another baby.
The current affair
Seung-Hi also went on to marry someone and have a kid too. In America, as luck would have it, she’d run into In-Ho again, and they’d soon start a love affair that will bloom into a very serious extramarital relationship right up to the present day.
At the Gusan University Hospital, both of them keep their affair a secret from the rest of the staff, which is a feat in itself since that kind of covert operations are difficult to pull of in a busy institution like that.
Keeping their affair a secret from the staff, In-Ho’s wife, and the rest of the world has been weighing on her for a long time and the Family Medicine doctor can’t take it anymore, constantly pressing In-Ho about it and expressing her frustrations at living life and continuing their relationship in such perpetual fear.