"Mental Coach Je Gal Gil" is a sports dramedy about a former athlete who finds a new calling. Je Gal Gil was once a taekwondo star, but after a tragic accident, he is forced to leave his career and become a psychologist. But not just any psychologist, a sports psychologist - thanks to his understanding of all the fears, problems, and complexes of his clients, he is very successful. His main task is to help people get rid of the national motto "Either first or nothing" and teach them to live comfortably with their abilities, age, injuries, and attitudes. Lee Yumi, who played a defector from North Korea with the number 240 in "Squid Game," has a leading role in the series.