当西瓜遇见夏天当少女遇见少年
[dāng xī guā yù jiàn xià tiān dāng shăo nǚ yù jiàn shăo nián]
A vivid description like 'When watermelon meets summer, when the maiden meets the lad' captures lighthearted moments, probably referring to sweet experiences akin to enjoying cold watermelon on hot days and young innocent love.