久居我心的你却从不交房租
[jiŭ jū wŏ xīn de nĭ què cóng bù jiāo fáng zū]
Translated to 'you live in my heart but never pay rent'. It humorously refers to someone (often a loved one) who occupies the heart yet brings no burdensome obligations, implying a precious presence cherished unconditionally.