They're sad because they are white-coloured and undecorated.
Solution
Tiffi spreads sprinkles on their head and turn golden brown.
Full list of appearances
Reality:
Marshmallow People are minor characters in Candy Crush Saga. They first appear in the 71st episode, Mellow Marshmallow. Before introducing level 1041, they have a new makeover by Tiffi, spreading sprinkles on their head.
Trivia[]
They are the first (and penultimate) characters that appear as a group.
This is the second (group of) characters to be released after the end of Dreamworld.
Due to April Fools 2020, almost all episode characters (but eight) have been absent from the game. A few other characters make occasional appearances in events.