天涯海角为你一骑绝尘一念执迷为你烽火连城
[tiān yá hăi jiăo wéi nĭ yī qí jué chén yī niàn zhí mí wéi nĭ fēng huŏ lián chéng]
Translates into traveling all over the ends of the earth to be with someone and vowing that one’s desire to be devoted to them would never fade, no matter what challenges arise. It implies a grand and unwavering devotion that would overcome many challenges even if it led to battles ('fiery battles spanning cities').