Hello, I'm inquiring 144 hour visa free transit policy. If I am a US citizen, who flies to Shang Hai and stay for 6 days, then go to Seoul for 4 days, then come back to Shang Hai for 6 more days, and then fly back to the U.S., would this qualify me for the no visa rule? Key is that I am coming back to the U.S. from Seoul. Thank you!