我的心早已被你署名
[wŏ de xīn zăo yĭ bèi nĭ shŭ míng]
My heart was long inscribed by you. A sweet expression that indicates one’s affections are reserved specifically for the mentioned ‘you’, often a lover or significant figure in a person’s life who has made an indelible impact on them, meaning my love belongs to you since long time ago.