Inoue, using the Manchurian-based artifact to mess up the timeline in the first place. His descendants control access to the crucial artifacts via the namesake's foundation.
Ito Hirobumi is assumed to be this himself. The movie implies that only the lack of his mere genius prevented Japan from entering the war on the Allied side, the nukage of Berlin instead of Hiroshima and Nagasaki, participating in the space race entering the United Nations as a permanent member and still retaining its recently conquered colonies.
Reality Subtext: The whole movie is nothing else than a promotion for Korean reunification, saying that a unified Korea would even be more of a tiger than South Korea has already been. Suffice to say, a reunification of Korea would in reality be just multiple times as costly and difficult as that of Germany could have ever been.