Taxi Driver S03 E15 A Bird’s Nest

"For the wronged victims whom no one protects."

Upon hearing the news that Master Sergeant Yoo Sun A, with whom he had served, has died, Do Gi immediately heads to the military unit where Master Sergeant Yoo last served. Before she died, she was demoted three ranks, which is unusual. Do Gi seeks to uncover the truth behind her death by following the last mission she carried out before she died.