With INFINITE's 'That Summer' concert kicking off recently, actor and singer Seo In Guk stepped up in support of his 'Reply 1997' cast member and INFINITE's "dancing machine", Hoya.

On August 9th, Seo in Guk took to his me2day to send a shout out to Hoya, writing, "Our Ho-President. Did you successfully pull off your concert? We hyungs are cheering for you. Fighting! I love you. Dongseng, stay strong and show us awesome performances during the remaining concerts!"

Along with his shout out, Seo also included a photo of himself and cast member Lee Si Uhn holding up a hand written message that read, "Ho-President, congratulations on your concert, be mine! Uh?"

Coming across the post, fans commented, "Seo In Guk, be mine! Uh?", "I think Seo In Guk's acting is the best on 'Reply 1997'", and "It's nice to see their close friendship".

In related news, Hoya and the other INFINITE members kicked off their 5-day 'That Summer' concert series on August 8th.

Source + Photo: Seo In Guk's me2day