所有深爱都是秘密所有暗恋都是枷锁
[suŏ yŏu shēn ài dōu shì mì mì suŏ yŏu àn liàn dōu shì jiā suŏ]
It indicates the idea that all deep affection or concealed loving feelings are burdensome secrets - a silent torture of falling for someone in silence without revealing oneself or obtaining mutual reciprocation.