Toronto - Shanghai - Seoul

Hi,

Similar question as the rest - arriving in Shanghai direct from Toronto on Mar 14 and then flying direct to Seoul on Mar 18. Travelling with a 7-yr child. I believe this should be fine to qualify for the 144-hr exemption, right? I just want to be 100% sure that I don't need to apply now for a China VISA or will encounter any problems when we land in Pudong International. Thanks!