夏天过了西瓜烂了深海蓝了少年溺了
[xià tiān guò le xī guā làn le shēn hăi lán le shăo nián nì le]
A metaphor for losing something or someone cherished once the season passed (summer gone and so is fresh watermelon). Then comparing the vast sea blue color to a teenager’s heart growing numb ('drowned'), symbolizing loss and sorrow after sweet moments