情路漫漫感动常在一生热爱回头太难
[qíng lù màn màn găn dòng cháng zài yī shēng rè ài huí tóu tài nán]
Describes how the road of love is long but feelings remain unchanged, meaning the love is passionate throughout life, suggesting one should keep moving forward and cherish all along instead of turning back when encountering difficulties.