BtoB's Sungjae recently updated fans with a friendly snapshot with 'Respond 1997' stars Seo In Guk and A Pink's Eunji.

A snapshot of Sungjae and the 'Respond 1997' stars was released on the 4th, drawing much attention from the fans of the three singers.

Fans were surprised by Sungjae's meeting with the sitcom stars, and also remarked on how much Sungjae and Seo In Guk look alike being that as the two are widely known as doppelgangers of each other. Netizens also picked up on how Seo In Guk and Eunji are putting three fingers in the air while Sungjae does the typical V sign, leaving them curious as to whether there may be a meaning behind the poses.

[Update: The mystery behind the three finger poses have been solved as BtoB has just announced that they will be coming back with their next title track, "Wow". Check it out here]