Action Square and 4:33 just released the Unreal Engine 4 Version of their Three Kingdoms Blade for the mobile device and the graphics look amazingly good. I spent some time trying the game out and it's pretty decent so far, featuring action combat with a swapping out multi-character system. The game seems to offer a lot of complex mechanics like building a small kingdom, building management, ranking units up, pvp, war, daily quests, unit combining, continent controlling, leveling up buildings, researching skills, and more.
This is probably the best looking Three Kingdoms type of game that you can play on your mobile device other than Nexon's Dynasty Warriors style game. If I had to pick between the two, I would probably go with this game. The progression feels a bit slow unless you whale your way through the game with the multiple packages that the game offers. After playing the game for a couple of hours, I managed to save up enough crystals to roll my first 10 roll Gacha with a guaranteed 4-star character. Three Kingdoms Blade also has an auto-play system for the lazy players, though it's a bit limited to normal attacks only unless you pay up with gold! The game seems to be really popular and rated high in both Apple and Google stores despite the sausage fest and lack of waifus, probably because it's a Three Kingdoms game and all. I'm going to continue playing just a little bit more, since I almost have enough crystals saved up to do another 10 pull gacha. The game is worth trying out, though you might get overwhelmed with the amount of management and things to do in the game, especially if you can't read Korean well. Unless you've played a lot of mobile games like me, then you should be able to get by just fine, as some of the system and mechanics are taken from other games.