Listen bruh if you want any real advice then TSR is the wrong place, this place is full of geeks that will neg if you aren't nice and polite like a little *****, i only come here for college questions
If you wanna get a lean face then you need a low body-fat percentage, but obviously you don't wanna be skinny so make sure you workout and try and go for the lean muscular look,
Once your 6 pack starts showing then you're on the right path.
Since it's impossible to just lose fat only on your face face you need to start doing cardio. High-intensity interval training are the most effective (look it up). I will literally takes less than 10 minutes a day
Then when it comes to diet, eliminate carbs and sugar.
You body uses carbohydrate as a source of energy, if it doesn't find it then it will use fat as a source of energy meaning that your BF% becomes lower. I know you asian people love rice (lol n/r) but that **** is HIGGH in carbs, so try and find an alternative. No bread,rice,pasta,grans etc, just try this for 4 weeks and you'll see noticeable results.
As i've mentioned before make sure you're working out while doing this so that you don't become lanky and so that you can get a lean muscular look with defined jaws.
Oh yeah also join bodybuilding forum for BroScience lol
Peace!