你若心不变我定情不移
[nĭ ruò xīn bù biàn wŏ dìng qíng bù yí]
If Your Heart Remains Unchanged, So Shall My Affection Endure: This phrase commits eternal devotion contingent upon reciprocated fidelity, indicating profound love and commitment that promises unwavering loyalty if met with honesty and constancy from the beloved other side.