A doctor bumps into an award-winning writer in a talk show, which leads them to a heated debate on an upcoming book about goodness. A man who comes from a family with a murder case, Jae Yeol, but doesn't know his guilt from what happened to his childhood. A woman from a debt family faces her anxieties even as a psychiatrist who slowly falls in love with him. Through thick and thin, the couple faces the problems of psychological disorders, with the hopes of having their love prevail amidst their considerable differences in lifestyles and beliefs. They are accompanied by senior psychologist Dong Min, a problematic Soo Gwang, high school student So Nyeo, and his friend Gang Woo.