Extremely Loud & Incredibly Close movie plot

In the memory of nine-year-old boy Oscar Schellplayed, the "September 11 Incident" is definitely the most terrible disaster he has ever experienced, because his fatherplayed bydied in the World Trade Center Collapsed, so he always called that day "the worst day." Now, a whole year has passed since the tragedy, and Oscar accidentally found an envelope with "Black" and a key. Oscar decided to find a man he had never met before, and to maintain vital contact with him-because it was this person who forced Oscar to face his innermost feelings with a playful attitude. The most unquenchable crazy fear. Oscar told this secret to the silent grandfather. As Oscar walked through 5 blocks in New York, just looking for the mysterious key that could open his knot, he accidentally encountered a series of brightly colored strangers. For one reason or another, they Everyone is a "survivor" in the disaster, but they hide their own deep sorrow and pain. In the process, Oscar not only discovered the invisible connection between him and his father whom he missed so much, but also his mother who seemed very far away from him and the noisy, dangerous and chaotic world around him. There is an inseparable relationship.