I don't know who is the bigger crybaby - this 8 years old from one year ago, or the grown ups who make such a big deal out of this video

Cho Chikun is known for crying sometimes, when he lost important title games. One such case is described here: https://senseis.xmp.net/?ChoChikun but there are others too...

Another one I read in Go World recently: after the 7th game of the Meijin title from 1985, Kobayashi Koichi commented "Cho started crying after I played this invasion" (the invasion ruined Cho's last hope to win the game, and therefore the match).

This game was played 9 months before Sumire achieved a jigo (even, taking komi) against a top pro, Cho U.

9 months represents about 15% of her entire playing career, and I'd wager that she was working very much harder then ever in those last 9 months. So, in her case, a massive improvement after the Tygem game is not really surprising. I think, also, that for people of limited experience (of any age) we must expect a lot of deep blips as they encounter new experiences, and the recent Ch'oe Cheong game may come under that category.

(...) A Korean friend told me that this particular game was in fact played on February 8th of 2019, not nine months prior as you had stated. The game was arranged when Sumire did a celebratory tour of South Korea as a 'newly-minted' professional. Her opponent was an amateur 5-Dan who was picked to play Sumire because he was of the same age, born in the same month in fact. (...)