Kung Fu Panda II: Peacock Screen in lord shen

Po's former village was attacked by lord shen, and Po's father went to war. At the moment when he was taken away, he saw the red sign on lord shen's feather and hid it in his memory. I didn't know my parents were dead until I was adopted, but when I saw lord shen again, the red sign reminded him of his memory, and his life story slowly surfaced. (Especially the last sentence of Kung Fu Panda, "My son is not dead yet")