ZE:A's Hyung Sik traveled back in time and showed off a selfie with school uniforms on.

On June 11, the member of ZE:A tweeted, "How is everyone at ZE:As doing these days? The suffocating weather has been pretty tough but I am glad to see it slow down with light rain. It feels nice," along with a photo of himself.

About the photo, he explained, "This picture is from Tooniverse's 'Trouble School' that Gwang Hee and Ye Won hosted." Making a childlike V sign with his fingers, Hyung Sik seems to have gone back to his high school years along with the school uniform.

Internet users have responded, "He looks great in school uniforms," "School uniforms have come a long way since the old days."