TVXQ stayed up every night to prepare for their concert.

TVXQ held the first concert of their world tour 'TVXQ! LIVE WORLD TOUR 'CATCH ME' IN SEOUL' on the 17th and 18th. Two nights before the concert, TVXQ concentrated on practicing their dance moves with the dance team all day and night.

SM's choreographer Shim Jae Won posted up pictures on his Twitter of the practice room, increasing the excitement for the concert. In the pictures, TVXQ and dancers look tired but they're smiling brightly, also excited for their concert. Shim Jae Won said, "Official studio rehearsal for TVXQ concert finished. I'm just thankful for everyone who smiled even though their bodies were about to break apart!! Luv ya! Everyone!"

The tickets for the concert had been sold out within 3 minutes of release, showing the power of TVXQ.

Photo Credit: Shim Jae Won Twitter