Jang Do-han (Kim Young-kwang) is a playboy in people's eyes. Although he is a prosecutor, he always gives people a cynical look. Looking at the way he eats, I don't want to make close friends with him. In fact, he became a prosecutor for revenge, and for revenge, he turned his life into two sides. In front of people, he is a cynical playboy, but behind people, he silently pays for the truth he wants to know. Zhao Xiuzhi (Lee Si-young) is a professional criminal policeman with a lovely daughter, but her daughter died unexpectedly. In order to uncover the truth of her daughter's death, she resigned and began a long journey. The collision of ethics and power, a story of a fragmented people overcoming pain together and guarding justice unfolds.