Shin Sung Han, a skilled divorce lawyer with a fitting name that means "sacred" in Korean, faces the challenge of dealing with eccentric clients regularly. Despite the emotionally taxing nature of his job, he finds comfort in his two closest friends and fellow "40-year-old youths," Jang Hyung Geun and Jo Jung Sik. Together, they navigate the ups and downs of life and work, all while trying to stay true to themselves and find happiness in their own ways.