Due to a horrible car accident years ago, Soo Yeon was at the brink of death and barely survived. As a result, he was given a machine-like right arm. Ever since, he refused to allow anything to move his heart. However, after meeting Yeo Reum, he decides to work at the airport for a bit longer and also becomes interested in her.
수연이 가진 비밀이 과연 무엇일지 의문을 품는 사람들이 늘어나면서 부담감을 느끼는 수연.
한편 사연이 있는 외국인을 돕기 위해 수연과 여름은 보안팀 직원들과 함께 마음을 합치는데, 이들의 하루는 무사히 끝날 수 있을까..
