Voice of a Murderer is a 2007 South Korean crime thriller film written and directed by Park Jin-pyo, starring Sol Kyung-gu, Kim Nam-joo, Kim Yeong-cheol and Gang Dong-won. It was the third top-grossing domestic film of 2007, with 3,143,247 tickets sold. The story is a fictionalized account of the real-life kidnapping case of 9-year-old Lee Hyung-ho in 1991.

Sol Kyung-gu is a South Korean actor. Sol studied Theater and Film at Hanyang University. Upon his graduation in 1994, he appeared in numerous theatrical productions, such as the hit Korean adaptation of the German rock musical Subway Line 1, and productions of Sam Shepard's True West and A. R. Gurney's Love Letters.