this one i don't understand sir.. please elaborate little more
FC-31 is been testing for years. its relatively a mature platform now. this aircraft can be exported with WS-21 engines if SAC get some serious order ... i mean within few years FC-31 can be ready for exports.
There is no way that Korean "stealth" fighter jet will be ready before FC-31. With the J-20 experience, they can scale up FC-31 much faster.