Kim Dahyun was the director of the largest hospital in Seoul and has to deal daily with Minatozaki Sana, the most egocentric doctor in the country

Dahyun had to deal with more big problems because of Sana, Sana was brilliant, she was a great doctor and saved many lives (even if she hated working). Dahyun always picked on Sana to make her mature and work like a good professional and Dahyun was very patient in enduring and responding to Sana's provocations

Dahyun was on a call, she was talking kindly to one of the investors while writing some things about the last patient she saw. Dahyun heard the door open abruptly and sighed when she saw it was Sana coming in, Sana never learned to knock on the door

"Okay, fine. I'll talk to you later, thank you"

Dahyun spoke gently as she hung up the phone and finished writing down the prognosis