Try 'Infinite Force', 'Infinite Salvation', and 'Infinite's Storm'.. :)

I LOVEEEE this one :D
http://www.asianfanfics.com/story/view/736277/inked-heart-myungsoo-myungyeol-sungyeol-hojong-donggyu-soulmates

Hahaha. Do u read woogyu? If you do I have lots to rec. My fav is Collide because the characters equally all have personalities that I think can connect with us best. Truely awesome fic. I've reread it so many times. More than ten. Im not kidding. If you eant more I have others to recomend^^

Have you read this -> http://www.asianfanfics.com/story/view/881892/n-a-woogyu-ot7

Or this one? -> http://www.asianfanfics.com/story/view/246299/the-difficulty-of-being-kim-sung-gyu-infinite-myungsoo-myungyeol-sunggyu-sungyeol-woogyu-woohyun