An important idea from Korea that Japanese used was the religion of Buddhism. This religion speaks of Nirvana, the state of desiring nothing. In Buddhism, you are supposed to overcome any great desire. At first the Japanese people didn't want to convert to Buddhism rather than their own religion, Shintoism. Shintoism is the belief that everything in nature is kami.
Another important idea the Japanese took from China was respect for your authorities. For example, children should obey their mother, wives should obey their husbands, subjects should obey the emperor, and so forth. The Japanese, like Confucius, the person who made this philosophy, believed that a stable and peaceful society could be achieved through this.