不忘初心只会爱你
[bù wàng chū xīn zhĭ huì ài nĭ]
It translates to 'Never forget why you started, I'll love only you', which could be a romantic promise of undying, dedicated love to someone. 'Remember your original aspiration' is actually a widely heard phrase in contemporary China, meaning not losing one's initial heart or purpose when moving forward.