与梦追寻似荒凉回首独望别忧伤
[yŭ mèng zhuī xún sì huāng liáng huí shŏu dú wàng bié yōu shāng]
It means 'Chasing dreams seems lonely; looking back alone, do not be sad.' This reflects feelings of solitude in pursuing dreams but also encourages not to dwell on sadness.