The film is about a lonely banker, who, after realizing he has no one to call during a moment of crisis, unwittingly encounters a young woman who harbors a quiet affection for him.

Bong-soo (Sol Kyung-Gu) has been working as manager of a small bank in an apartment complex for three years.

Inside a subway train that has suddenly stopped on his way to work, everyone around him reaches for their cell phones to call someone.

He does not know that inside the educational center across the street from the bank where he works, a 27-year-old woman Won-ju (Jeon Do-Yeon) is looking over to him, nourishing a small love.

One day, while looking over the bank's CCTV tapes, Bong-soo discovers someone pitifully calling out his name to the small, closed-circuit camera that does not even record sound.