In this one Donghae is blind. He thinks Hyukjae is cheating on him because he's been coming home late smelling of cologne. They fight and Hyuk goes to stay with Ryeowook and Yesung (I think - it could also be Kyuhyun and Sungmin)

Anyway, Hae just sits around in the dark depressed, even when the others visit. He's heating something in the microwave when he decides to fight for Hyuk. He runs out of the house to go to Hyuk's workplace when he gets hit by a car.

As this is happening, their house is on fire (from Hae leaving the food cooking). Hyuk finds out and rushes home to find Hae but the firemen say no one was inside. Then they get a call saying Hae was in the hospital from being hit by a car.

Hyuk goes to the hospital and it comes out that he wasn't cheating, but working with a doctor looking for cornea transplant donors to give Hae his eyesight back. 

Can anyone help?

A big thank you to Star-Lord for finding this.

Selfless - Asianfanfics