Kim Minju returns to Seoul after her sister receives an anonymous death threat. But little can be done as she lacks the resources and reinforcements necessary to keep her sister safe. Unless she seeks out assistance from Kim Chaewon, who is South Korea's most powerful gang leader, a Tycoon, and her ex, she and her sister are helpless. So will they be able to put their differences and past aside for the sake of Minju's sister?

 "I don't know why we're still together. I don't know why I didn't leave you. I don't know why I didn't let you leave me. I can't use any words to describe it. All I know is, it's what my heart tells me," he added, placing her hand by his chest. "We've been together for seven years, no need for cheesy crap but just to let you know, you're the only woman who made my heart beat so crazy, I even went to the hospital to check if I'm going down with an illness or what."

Some people live to race while others race to live. When an uptown girl's and street racer's worlds collide, their lives are bound to change. For the better or worse, it's