In an interview for the new film, My Special Brother, Lee Kwang Soo said, "In Sung hyung is my special brother, like the movie title!".
He explained: “I tend to turn to In Sung hyung first when I have some interest. I also shared my concern with him when I received an offer for this movie. Hyung is the first person to point out the parts I care about, then, he said I should try "
Lee Kwang Soo and Jo In Sung became close after working together in SBS 2014 drama "It's Okay, That's Love".