Working as a resident at a general hospital, Yeon-joo suffers from a lack of sleep and has no time for relationships. She wants to be a brilliant doctor, but her personal life is a mess as she cannot find a stable relationship with guys. Even though she is quite lovely, she finds herself being used by guys and eventually breaking up with them. Then one day, she encounters the man of her dreams, and it was obvious that he was going to ruin her life.