21 grams

Paul (Sean Penn) ), a university mathematics professor who suffered from severe heart disease and was in critical condition. Fortunately, a successful heart transplant allowed him to escape death, but his relationship with his wife did not regain a new lease of life. Jack (Benicio de Toro) was once an alcoholic and criminal. With the help of a priest, he rebuilt his life and became not only a youth counselor, but also an upright and kind father. But sometimes his wife secretly hoped that he could retain a little of his past personality. In fact, Jack is full of guilt about the past, burdened with a heavy psychological burden, and trying to find the hope of a new life. Christine (played by Naomi Watts), she was once addicted to drugs and partying, and her life was in a mess. When she repented and reformed, her life took a terrible turn due to a catastrophic incident, and she fell into trouble again. Unable to withstand such a blow, she went back to the past and refused to change. A traffic accident connected the lives of these three people, and with it came suffering, revenge, love and redemption.