Who is girl in I will possess your heart video?

The girl in the "I Will Possess Your Heart" video is Jung Chae Yeon, a South Korean singer and actress. She is a member of the girl group DIA and was also a temporary member of the girl group I.O.I from 2016 to 2017. In the video, Chae Yeon portrays the love interest of singer and actor Seo In Guk.