所谓的单恋恋的都是心酸
[suŏ wèi de dān liàn liàn de dōu shì xīn suān]
'So-called one-sided love is all heartache,' highlighting the bittersweet feeling of loving someone who doesn't return your affection equally. It acknowledges emotional vulnerability, especially in situations lacking reciprocated passion or understanding, reflecting on the loneliness and pain involved.