Idol group Super Junior's Leeteuk, who is currently serving in the army, sent a letter.

In SBS "Strong Heart" filmed recently, Leeteuk's letter from the camp was revealed.

In the letter, Leeteuk said, "To the families and viewers of 'Strong Heart'," and gave his greeting to all the staff and viewers of "Strong Heart," touching many hearts.

Leeteuk was recently known to have received an award in the army for his excellent shooting.