海誓山盟我等你天涯海角我陪你
[hăi shì shān méng wŏ dĕng nĭ tiān yá hăi jiăo wŏ péi nĭ]
It signifies unwavering commitment and promise to wait for and support someone, regardless of distance or obstacles; willing to go all lengths just like the old Chinese saying about ‘sea vows and mountain alliances'.