Sixth-year medical student Na is full of talent but no luck. She's always thought that with effort comes success, but events in her life have led her to the suspicion recently that, really, it all comes down to fortune. Most significantly, Na has fallen for Nine, a handsome and intelligent senior beyond her reach. In order to force a change of fortune, Na decides to switch to a lucky phone number. It's then that she meets Leemai and soon she's much more than noticed by her crush.