[Shenzhen Airline】Hanoi-Shenzhen-London Economy class. I failed visa-free entry. 

Interesting to compare the 2 airports. Hanoi's airport is as busy as before the coronavirus, but Shenzhen's airport is like still under the coronavirus.
Transfers to connecting flights are very easy unlike in Shanghai. When you enter the terminal building you just go up the escalator on the left. Just show your boarding pass and passport and go through the security check.
visa-free transit
On my way to Hanoi, It was no problem.
On the return flight, no
It was not the immigration officer who refused entry. Shenzhen airline staff took me and another passenger to the transit desk.
I have no idea why. I should have insisted more strongly? i don`t know.
0:00 Introduction
1:30 Bus 86
2:40 Hanoi Airport
9:08 ZH9088
9:35 Shenzhen Airport
10:47 Departure lounge
15:44 VIP Lounge
17:42 ZH9067
18:44 LHR
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