Ou alors faire un booking Seoul-Shanghai-(somewhere outside china sous 48h) et rentrer en Chine avec un visa transit ?
Visas are not required of passport holders of the following countries, who transit through Pudong Airport or Hongqiao Airport of Shanghai, provided they hold valid passports, visas for the onward countries, final destination tickets and have booked seats, and stay in Shanghai for less than 48 hours:
Republic of Korea, United States, Canada, Australia, New Zealand, Germany, France, Netherlands, Belgium, Luxembourg, Portugal, Spain, Italy, Austria, Greece, Sweden, Denmark, Norway, Finland, Iceland.
Mais il va te falloir t'activer une fois sur place, ca veut dire descente de l'avion->fac->PSB non stop