There are 4 couples made up of 4 people 

Before Couples:

Seohyun<3 Kyuhyun 

Sooyoung<3 Ryeowook

After Couples:

Seohyun<3 Ryeowook

Sooyoung<3 Kyuhyun

This is my second fanfic but pls support me and NO silent readers... :-)