我深知他是梦却咬牙不放手
[wŏ shēn zhī tā shì mèng què yăo yá bù fàng shŏu]
'Wo Shen Zhi Ta Shi Meng Que Yao Ya Bu Fang Shou', which means 'I know he is a dream yet I grit my teeth and do not let go.' It conveys a struggle and determination despite realizing something isn't feasible or achievable.