西瓜很苦苦瓜很甜
[xī guā hĕn kŭ kŭ guā hĕn tián]
It literally means 'Watermelon Is Bitter and Bitter Melon Is Sweet', an irony or playful inversion suggesting that sometimes expectations and reality contrast dramatically, things aren't always as expected. It could symbolize how challenges often disguise rewards.