As the Goodwill Ambassador of UNICEF Korea, Super Junior's Siwon has been very active in person with his involvement in regards to UNICEF's various voluntary activities. He would also be involved in sending out strong messages for the organization which he would film video messages for. Recently, in a behind the scenes clip, bloopers from Siwon's message recording actually showed the Super Junior member falling for the staffs' trick.
Siwon was going send his gratefulness through 'Thank you' in various languages that were written for him only a cue board. Siwon said, "Thank you" in English first before he went "Terima Kasih" which is 'Thank you' in Malay before checking the board closer for the last one that he slowly read "Kamsaham..." only to realize it was 'Thank You' in Korean that was romanized.
Upon realization, Siwon's expression totally showed how he totally fell for their trick when the staffs could be heard laughing in the background.