Jung Yong-hwa
"In My Head" was written by Kenji Tamai and Yoshifumi Kanamaru and composed by Jung Yong-hwa. "Mr. KIA (Know It All)" was written and composed by Jung Yong Hwa and Ryo. "Rain of Blessing" was written by Kenji Tamai, Kaori Fukano and Keisuke and composed by Lee Jong-hyun and Ryo.