Having dominated for the majority of the first half, five-time World Cup winners Brazil broke the deadlock in the 44th minute.
Barcelona forward Neymar, who had been fouled on the edge of the area, returned to his feet to convert the resultant free kick.
The scoring was completed just four minutes after the restart through Oscar. Paulinho was the creator, having split the home defence with a through pass for the Chelsea midfielder. From there, he rounded goalkeeper Jung Sung-Ryong and then rolled the ball into an empty net.
Next up for Brazil is another friendly in Beijing on Tuesday night against Zambia.