On the September 25th episode of SBS' 'Strong Heart', Kim Ji Hoon revealed handwritten letters that he received from f(x)'s Sulli herself during his time in the army.

Kim Ji Hoon shared, "I want to give my thanks to Sulli. A letter was mailed to my army camp. It was October 4th around the time of [Pepero Day]. She sent me [peperos] along with the letter. I didn't have any mutual friends with Sulli, but she still was able to send them. I read her letter, and it said that she made the cookies herself. I am a person who ate the cookies that Sulli herself made. I didn't think you would believe me, so I brought the letters here. I'm sorry but on TV, I'm gonna have to brag about Sulli a bit."

The handwritten letter from Sulli read, "How are you Ji Hoon oppa. This is Sulli. I heard from Jae Won oppa that the oppa I always saw on TV went to the army. My older brother is also having a hard time in the army. I will work hard in the acting field, so that I can act with you, oppa. I am sending you the sweets I made myself. When you are having a hard time during your stay, I hope that you can meet a good senior and be comfortable. I will pray for you. Be careful of catching a cold."

Kim Ji Hoon also revealed, "I sent her a reply and she sent a reply back," surprising everyone on set.

Source + Image(s): Newsen via Nate