To avoid visa, I can take a flight out of china n come back to stay less than 15 days here?

Hi for me as a Singaporean , I originally plan a trip from
9 nov to 1st dec n than realize that if I were to stay
More than 15 days In china ,I need a visa as a Singaporean .

To avoid e visa requirement during this trip , I can take a flight out
Of china n come back to stay less than 15 days here? Like going
Nearby to hk or Seoul? Any idea?
Thanks