我想伴你99不88
[wŏ xiăng bàn nĭ 99 bù 88]
It means 'I want to accompany you 99 times rather than 88,' which sounds similar to wishing to spend a lifetime with the other person because numbers 88 and 99 in Mandarin sound close to the expressions for 'goodbye.' It suggests the willingness to spend many happy times or moments ('companionships') with a loved one without parting.