Chang and The Yeti
Chang remained unmentioned in the stories until Tintin in Tibet, published almost 25 years later in 1958. In this story, Chang sends Tintin a letter in which he announces his imminent move from Hong Kong, where he had been living, to London in order to work in an antique shop owned by a brother of Wang's. His aeroplane, however, crashes over the mountains of Tibet. Chang survives the disaster while all his fellow passengers perish, and is rescued by the yeti, the mythical creature said to live in the Himalayas. The yeti takes care of Chang, providing him with food, but when rescue arrives, he also takes Chang, weak with fever, as far away as possible.
Tintin is convinced that Chang is not dead, after seeing him in a dream calling for help. Against all logic he sets off to find him, with the grudging help of Captain Haddock who, along with almost everyone else, believes Chang to be deceased.
Tintin and Haddock eventually track Chang and the yeti down to another cave, and manage to get him out, following a tearful reunion.
Although he has to leave him, Chang is very grateful to the yeti for keeping him alive and describes him as "poor snowman", rather than "abominable". When Tintin wonders if he might one day be captured, Chang objects to this, feeling that the yeti should be looked upon as a human rather than a wild animal.
Chang later goes to London from where he keeps in touch, sending letters to Tintin and Haddock (see The Castafiore Emerald).
Read more about this topic: Chang Chong-Chen