“There is a bird on your shoulder. A Blue Bird." Eun-woo secretly liked Hae-ri, his high school classmate who’s actually older than him. At the same time, Eun-woo hears mysterious words from his friend Do-young who sees ghosts. After seven years, the two met at the reunion. With a fluttering heart, he gets to spend time alone with Hae-ri, but the conversation keeps getting out of place.