你为我画地为牢我为你逆天填海
[nĭ wéi wŏ huà dì wéi láo wŏ wéi nĭ nì tiān tián hăi]
A metaphorical phrase meaning you're bound or entrapped by someone who loves deeply (drawing boundaries), while the person would go against the world (fill the sea) for their beloved—one sacrifices for the other’s freedom.