Jung Dasom goes on a blind date in place of her sister for a small payment, only to discover that her date is the emergency medicine professor at the university hospital where she is about to start her residency. Known as a cold-blooded figure in the ER, he suggests they continue seeing each other seriously, almost like a proposal, leaving Dasom panicking about whether to confess the truth or run away. An emergency call interrupts the meeting, and later they reunite as professor and resident at the hospital. Now Dasom must hide the secret of the fake blind date while working under him, leading to a tense yet romantic medical story.