Choi siwon is a world-renowned neurosurgeon who had just transferred to Seoul hospital for over a year. Every morning he would visit the coffee shop just a few blocks away from the hospital in order to get his highly-needed-daily-dose of strong caffeine.That was the place where he met a pale guy with a very warm smile and cute apple cheeks who happened to be a new barista of the shop. Little does he know that the boy whom he met hide a very unusual condition. A condition that might need his professional and well.. "unprofessional" help.