Correct

海枯石烂

/ hǎi kū shí làn / 
Strokes

Definition

lit. when the seas run dry and the stones go soft (idiom)/fig. forever/until the end of time

Example

Definition

till the seas dry up and the rocks crumble; no matter what happens [in an oath expressing firm will or unchanging fidelity]

1
Hǎikūshílàn
海枯石烂
  
,
cǐ
此
xīn
心
bù
不
biàn
变
  
。

Seas may dry up and rocks turn to dust, but our hearts will always remain loyal.