You are mine - WhenIseeUsmile (author of asianfanfics)

Seungri is a dedicated marketing assistant and loves his job and what he hates most are street gangs. However, due to a coincidence, Jiyong, a member of the cruellest street gang in Seoul, claims him and gives Seungri two choices: become his or die. What will Seungri choose?

If you find this story interesting, please go to the link below and support the author.
http://www.asianfanfics.com/story/view/979618/you-are-mine-gdragon-gri-seungri-daetop-nyongtory

P.S: i love this story so much, i just have to recommend it.