Recently, Seo In Guk posted a photo of him and 'Reply 1997' co-star Hoya backstage at INFINITE's 'That Summer' concert.

On the 12th, the singer turned actor posted a photo on his twitter saying, "Today I went to see INFINITE's concert. Chairman Hoya �is truly a dance machine... Daebak�occurrence... Junhee ya know I love ya right...."

The two on-screen and real-life friends could be seen holding their thumbs up and displaying their friendship in the photograph.

Netizens who came across the photo replied, "You two surprisingly look good together", "Tuning in to Reply 1997!", "Where did Seo In Guk learn how to act, did it just come naturally?", and more.

Tune in to 'Reply 1997' every Tuesday to catch Hoya, Seo In Guk, Eun Ji won, and A Pink's Eunji and friends in their high�schooler�roles.

Source + Image:�Seo In Guk's Twitter