Youll want to start by picking either the shu or wu kingdom during that big choice in chapter 3, since that's what sets up all the good stuff between these two leaders. If you go with shu, you'll be following liu bei's story, while wu puts you with sun quan, and both paths have their own interesting moments.

The real magic happens during those big coalition battles where both kingdoms show up. Keep pushing through the story missions, and you'll see them cross paths naturally especially during those fights against lu bu or cao cao. Something worth noting is that you should complete special requests when they pop up, since that affects how deep their interactions can go.

When you're in those shared battles, try to take out the marked officers quickly, as that usually triggers some pretty cool dialogue between them. Their conversations get particularly interesting around the jing province chapters, and if you manage to change some key historical moments, you might see some unique exchanges that most players miss. Keep an eye out for those special objectives during battles too, since finishing them before certain other events happen can unlock some rare scenes between the two.

Remember that their relationship changes quite a bit throughout the story, so their dialogue will reflect that especially if you've been building up their bond levels through missions and requests. Sometimes taking a different approach to major battles can lead to completely different conversations between them which is pretty neat when you're trying to see all the possible outcomes.