On September 1, Pentagon teased for their upcoming 4th mini album 'Demo_01' with a short film for a song titled "When I Was In Love"!

In the short film, actress Gong Seung Yeon portrays an array of emotions by using a magical match light, which turns your sorrows into heart fluttering. However, she only has 5 matches in her small box, and quickly uses them up, returning to her dark, despairing, and lonely room.�

It turns out, Gong Seung Yeon decided to appear in the short film to support Pentagon's comeback because of her friendship with member Jinho! Both Jinho and Gong Seung Yeon are known former SM trainees, and they must be maintaining a good friendship even after going their separate paths!

SEE ALSO: Kim Chae Won's social media upload sparks speculation: Is she responding to the haters criticizing LE SSERAFIM's live performance?

If you haven't already, you can check out Pentagon's teaser short film here! The full release of Pentagon's 4th mini album is set for September 6 at 6PM KST.�