[SIDE STORY OF PEARL BOY] Baek Seunghyun, longtime right-hand man to yakuza boss Shin Jaeil, spirals after Jaeil—whom he saw as a father—gets married. Struggling with his emotions, Seunghyun runs off and bumps into Yuta, a man from his past in Japan. Expecting a quiet drink, he's blindsided when Yuta turns hostile. That encounter sparks the chaos that follows, as Yuta crashes into Seunghyun’s life and throws everything off course.