Kim Jong Kook was the boy who lived. Song Ji Hyo, the sister of Song Joong Ki, already knew she was going to Hogwarts. What will happen when Song Ji Hyo meet Kim Jong Kook in Hogwarts?   Characters in book, Character in Harry Potter Kim Jong Kook as Harry Potter. Song Ji Hyo as Luna Malfoy. (oc, sister of Draco Malfoy) Ji Suk Jin as Lucius Malfoy. (father of Luna and Draco Malfoy) Song Joong Ki as Draco Malf