Nobody seems to have posted the link for this (think coz busy with comeback) on YT so let me try to upload it from the source. Hope the credits are in order.

Baby made a surprise visit to Kim Chang Ryeol on his radio programme Old School again on 2nd June. His dancing and dorkiness is so cute...

credit: 501 스런하루 @ ss601 + hyungjunbaby @ YT