Soo Min works as a nutritionist at a food company. She seems to live a perfect life. Her husband Jin Woo is a successful analyst and their son currently studies abroad. Yet, Soo Min is not happy with her life. She feels that Jin Woo and her son ignores her. Soo Min then meets Sang Hyun. She used to be friends with Sang Hyun. His wife was killed by a drunk driver. He is now in Seoul.

Song Jin Woo has worked as a non-permanent contract employee for the past 4 years at Moojin Girls' High School. He is a good teacher and dreams of a school where no one is left out. New contract teacher, Yoo Sung Pil, comes to Moojin Girls' High School. When Song Jin Woo was a high school student, he was bullied by Yoo Sung Pil and other students.

A story that depicts a strange and mysterious world of work between dreams, self-realization and means of maintaining a livelihood.