BaekHyun and you were best friends since high school. Your parents were best friends so that's how the two of you know each other. The two of you know each other extremely well. When the two of you finished high school, you decided to become a vet while he decided to become a surgeon. You love him sincerely. However, BaekHyun is arranged to marry your sister, EunJin, who is also a surgeon. Coming from a family background full of doctors, they were the most desirable couple. How will BaekHyun and you react?