People from China and Japan, from different backgrounds, are driven by a shared mission: bringing a hidden history to light. Wang Xuan, a descendant of biological warfare victims, led 180 plaintiffs to Japan for 27 court hearings. Hideo Shimizu, recruited into Unit 731 at 14, broke his silence at 86 and returned to Harbin at 94 to apologize. Japanese teacher Tamaki Matsuoka spent 36 years traveling between China and Japan, meeting more than 300 survivors. The Zijin Grass Choir carries the message of peace through song. Those Who Keep Moving follows those who continue to press on, determined to preserve a history that must never be forgotten.