It is the one and only Kim Da-hyun!
According to Channel Korea, Da-hyun was initially training to be an actress under JYP Entertainment with fellow TWICE member Jihyo. She actually appeared TWICE in music videos of their seniors in the agency.
Da-hyun was the main character in GOT7’s “Stop It Stop It” released in 2014.
She also had a short appearance in the “Rose” M/V of 2PM’s Wooyoung.
Da-hyun has always had that visuals isnt’ she?
Source: Channel Korea