Hello there

I have a question even thought I feel like its a silly one but i won't lose a thing for asking

So now I have booked a flight from seoul to jeddah on the 4th of July and my transit in the airport is for 12 hours so I'm asking if I can make my flight from seoul to Hong Kong in the first of July and my flight from Hong Kong to jeddah on the 4th of July without adding any amount of money ?

Thanks