BtoB’s Sungjae recently took a friendly photo with A Pink’s Eunji and Seo In Guk, hinting his possible appearance on the sitcom, ‘Respond 1997’.

On September 4, BtoB’s official Twitter posted, “Reply melody,” and “WOW”. Two photos were included, showing the three singers posing closely together. Fans speculated that Sungjae will be making a cameo appearance for the drama as he is widely known as doppelganger of Seo In Guk.

In addition, the meaning behind the three finger poses have been revealed as BtoB has just announced that they will be coming back with their next title track, “WOW”.