The trio were on a recent recording of 'Happy Together 3' together, where the TWICE girls revealed that the choreography to "Signal" had J.Y. Park's aegyo in it. Sana said, "PD J.Y. Park always shows us aegyo. He does 'sha sha sha' and also gives us hearts." They then demonstrated a bit of the "Signal" choreo.
The episode will air on May 11 at 11:10 PM KST!