I would recommend 'irreversible' by sujudom. Its 3rd chap in her one-shot collection. I would have to warn you that it is mpreg, character death and friend-locked.

There is a story called " my broken angel" by CinamonSwirl it's sad but very beautiful you will be smiling with tears. It has a slight eunhae in it but it is crucial for the story .
Here is the link http://www.asianfanfics.com/story/view/272526
Hope that helped :)