During Cold War, a secret mission whose existing chance is lower than Russian Roulette, 28 Black Cat team pilots' life stories gives out a topic without answers : Who is a real hero? In black cat team, 28 pilots participated the mission for 14 years, as 7 passed away in the training, 3 passed away in the mission. Another 2, were shot down captured, then left home for more than 20 years. Maybe such a touching story is destined not to extinguish along the time. Director Jonathan Yang was trekking from Asia through America to Europe, racing with time. As having spent 5 years to recall the last remaining days of these officers, he writes out the atmosphere of that big era from the telling of these old officers. Audience can see the solidest loyalty, and the common inspiration of that era from the light talk of these officers. 45 years after last mission of Black cat team, the documentary speaks out for the era again. It gives us a tender and strong reminder. It reminds us not to forget people who have guarded us. In certain auditioning afternoon, The director said: This is the memoir I want to leave to the next generation.