Spycraft has always been a huge part of warfare, and is about to play a pretty pivotal role in this conflict. To get admiral isun shin out of the picture, the japanese realize they need to get a little creative if their second invasion is going to have any chance of success. They've got to establish reliable supply lines, and that can't happen while admiral y is blasting all their ships apart. So what they decide to do is deploy a double agent to seed disinformation into the crean chain of command. The goal was to sow chaos and exploit the factional nature of the korean government.