From all of the match ups that I have played, Dragon's Fire Liu Kang is the most difficult one. You have to understand how the pressure works and your options.
f+2,1,3 xx FBC, f+2,1,3 xx FBC, f+2,1,3 xx FBC is just like pre-patch Scorpion's 2,1,4 xx FBC. If you block the first hit, you are blocking three loops of the same string.
EX flying kick is +2 on block. f+1 (10F) beats f+2 but trades with b+1 (9F). f+1 loses to f+1 (6F) and d+3 (12F low, +1 on block). Backward flash parry (i.e., EX d,b+2 canceled into a backdash) avoids all of the aforementioned options mid screen, including b+1. You cannot waste too much meter on backward flash parries so you must establish f+1 as a primary defensive option. You have no choice. You will otherwise be chipped to death. Because Tremor is able to get 40%+ of damage after f+1,2 with one bar of meter, trying to poke with f+1 is worth the risk. Force the Liu Kang player to use b+1, f+1, and d+3 after EX flying kick. Unlike f+2,1,3, b+1 xx FBC and f+1 xx FBC only give minor advantages on block.
Liu Kang has good zoning too, but the name of the game is Mortal Kombat X so he is far less of a threat far away than he is up close. Approach the zoning carefully. Do not foolishly run into d+3 and f+2,1,3.
Aside from EX flying kick and b+2, he is not very strong at mid range. f+2 and f+4 are fast moves, but they only hit if you are close to Liu Kang.
