Son Na Eun as the undercover rookie racer 'Rei'
❝ Wait, I won't have to get a tattoo to fit in with the biker gang, right?! Cause I already have one right above my... You know what, never mind. The point is that I regret it and there's no way that I am getting the Aces sign tattooed on my forehead. ❞
Byun Baekhyun as the second in command 'Crow'
❝ I don't care if I'm mean. Life is tough and the sooner you deal with it, the better. You've been to prison, so you should know that more than anyone else. There are things that make it a little better though. Like motorcycles. Wanna go for a ride? ❞
Kim Junmyeon as the biker gang leader 'Flash'
❝ Nobody messes with the Aces. ❞
Zhang Yixing as the second police informant in the gang
❝ We could try to be responsible or... We could get high and dance the night away. ❞
Kim Won Shik as the fighting trainer Ravi
❝ I don't care if you're nervous. My gym, my rules. You have three seconds to punch me like you mean it. Or as you put it, like I just shattered your favourite makeup palette. ❞
Jackson Wang as the police officer in charge of case 384
❝ Maybe if I smile long enough, I'll trick myself into forgetting about this fail... And before you say anything, no, there are no tears in my eyes, so the fail that I am talking about is clearly not my life. ❞
Ahn Hye Jin as the fatal woman 'Hwasa'
❝ You just made urself a very powerful enemy. I have 49 followers on my blog and they are going to hear all about this...I just checked, so make that 48, but that doesn't prove your point at all... and it went down to 47. You know what, you are clearly disrupting my mojo, so let me just show myself out of here. At this rate I'll never become famous and get a chance to leave this shitty job. ❞
Kang Seulgi as the underground fighting champion 'Viper'
❝ Watch what you say next. Don't you know who you're dealing with? ❞
Chae Hyungwon as the weapons supplier
❝ You don't even want to know how many insults I'm holding back right now. ❞
Lee Felix as the new motorcycle racing recruit
❝ Why am I doing this? It's rare to find something that lights up your heart. Now that I have it, why would I let it go? ❞
Park Chanyeol as the gang's mechanic
❝ The D in my Harvard law degree is silent. Mostly because I bought it from a guy around a street corner who can't see very well and refuses to pay for a new eye prescription... My point is, I am totally qualified to fix your precious motorcycle. ❞
Lee Taeyong as the treasurer
❝ You can break as many of my calculators that you want. I have enough spare ones to host a maths competition. They'll be added to your tab though. It's not my fault that you are broke and you can't handle the truth. How about making a deal with me and I'll make you rich? ❞
Do Kyungsoo as the gang's strategist
❝ Shut your mouth or I'll do it. With my fist... Wait is it just me or did that sound oddly sexual? Cause I can totally demonstrate what I actually meant by punching your teeth out of your mouth. ❞