买烟火的小男孩卖火柴的小女孩
[măi yān huŏ de xiăo nán hái mài huŏ chái de xiăo nǚ hái]
It means 'The boy who sells fireworks, the girl who sells matches'. Likely inspired by the fairy tale of 'The Little Match Girl', these two characters depict children trying to find joy/comfort in hardship amidst festive celebrations.