Do Japanese individual tourist visas signed in Korea have to leave from Korea?

It is difficult to get a visa in your case. Because your Korean visa is about to expire, if you go to Japan during this time, you will be in danger of being suspected. If you travel directly from South Korea to Japan, it is more likely. If you return to China, the possibility of getting a visa is extremely small. Japan is now cracking down on illegal activities very severely. In addition, Japanese tourists will not get individual visas in China.

If you really want to travel to Japan, find a tour group after returning home, because you have past experience in Korea, so it will be easy to get a visa. If you have other ideas, I advise you not to come. Japan is not a paradise.