Comment by Yuki on Kiss me, Liar - Chapter 30

@Yuki No, in this case Grayson, Keith's bestie who goes to those orgies.

@karasu hime but I think it's that chase Millar cause there is also Josh, and his sister told that he has a kid remember, it has to be them

@Starlight Chase doesn't hang out in the same circles as Grayson and Keith. Yeunwoo knows Grayson because he's talked to him numerous of times at Keith's. 
The only time he really is concerned with Chase is during the filing of something and Chase kept skipping the meetings.

@karasu hime remember chase brother forcing him to go to parties

@karasu hime haha go and see the new chapter u will know they are the same person