If you place 3 dragon symbols anywhere on the reels at the same time, it will trigger Dragon's free game features. You will get 12 free spins with a dynamic multiplier starting at 1x. The multiplier increases with rotation, where there is at least one dragon on the reel and the rotation is reduced without the dragon. The multiplier you get will be applied to the next rotation. If you get the dragon symbol on the reels during the feature, you get an extra free spin and add an extra winning multiple.
Basically, there is no limit to the number of free spins you can get, so this is a big win. Wu Long Slots is certainly worth a try because the betting range is very large. I recommend betting on what makes you feel comfortable and see if you can get those free spins.