The Great Outdoors! I can imagine Chang and Tintin going on camping or hiking trips for dates. While they love exploring museums and flea markets, in the woods they can avoid public scrutiny.
I've just been in the mood for drawing in ink and also doing long walks outside. These are inked traditionally and coloured digitally.
I remember discussing Tintin casting choices with a friend from Germany and remarked how it was odd he often has an English accent in adaptations rather than a Belgian one, and my friend just replied "that's because Tintin gives incredibly strong English boy energy (derogatory)"
Here in the UK there's a lot of weird classism tied into accents. Today accent diversity and representation in broadcasting is actively pursued but in Tintin's time there certainly was a preferred accent to have.
imagine this exchange happens between pages 28-29 in The Crab with the Golden Claws