In total, there are four changes, and the emotional changes between the two people sublimate the theme of the film, mainly the change in the attitude of the white driver Tony towards the black pianist Tang.

First of all, the two people disliked and disliked each other in the early days. At the beginning of the movie, Tony throws the water glass that the black man drank from into the trash can, and speaks mockingly to the black man to his wife. It can be seen that Tony has serious racial discrimination and he hates black people. So even though he worked as a driver for Don, a pianist, he still looked down on the black man from the bottom of his heart. He can be said to be very rude to Don. He ate the bread given by his wife without asking Don, took his wallet when he got off the car, etc., which all show Tony's prejudice against black people.

The second change occurred when Tony listened to Tang's piano performance. He called Tang a pianist in his heart to his wife. It can be seen that Tony was deeply impressed by Tang's playing skills, and even more so. Most of them respected his profession, but still did not put aside their prejudice against Tang himself.

The third time, the further south they went, the more unfairly Tang was treated. In order to protect Tang, Tony beat the police and was arrested at the police station. The subsequent conversation between the two people as they got off the bus made Tony realize that they were actually the same type of person. In the letter home to his wife, Tony offered to let Tang polish it. Tony officially accepted Don from the bottom of his heart.

For the fourth time, Don canceled his last concert and returned to the north. At Tony's invitation, Don went to Tony's home. At that moment, both of them were relieved. Really became friends.