Soul Mechanic is a human drama about the stories of psychiatrists living in a crazy world. Through various stories, the drama aims to ask, "Where does happiness come from?" and share a heartwarming message of comfort with viewers. Lee Shi Joon is a psychiatrist at a hospital. He is passionate about his work and helping his patients. Han Woo Joo is a rising star as a musical actress. She is honest and has integrity. She loves her work as a musical actress.