Workaholic program director Lee Ahn (Choi Soo Young, Girls’ Generation, Squad 38) is in love with her long-time boyfriend Kim Jin Young (Shim Hee Sup, Rebel: Thief of the People). She can’t imagine life without him. And when Kim Jin Young passes away in a car accident, she has to. All Lee Ahn has left of Kim Jin Young is his smartphone. He died trying to say something to her, and the phone holds the key to what it was.