Plot: Min Joon Gook is planning his revenge on Hye Sung. Meanwhile, Hye Sung and Gwan Woo both receive a case involving twin brothers
Cast
Lee Bo-youngJang Hye-SungLee Bo-young was 34 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Jan 12 1979
Lee Jong-sukPark Soo-HaLee Jong-suk was 23 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Thu, Sep 14 1989
Yoon Sang-hyunCha Kwan-WooYoon Sang-hyun was 39 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Sep 21 1973
Lee Da-heeSeo Do-YeonLee Da-hee was 28 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Mar 15 1985
Jung Woong-inMin Joon-KookJung Woong-in was 43 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Jan 20 1970
Kim Hae-sookEo Choon-SimKim Hae-sook was 57 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Dec 30 1955
Kim Kwang-kyuKim Kong-SookKim Kwang-kyu was 45 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Dec 19 1967
Jeong Dong-hwanSeo Dae-SeokJeong Dong-hwan was 63 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Aug 05 1949
Kim Ga-eunKo Sung-BinKim Ga-eun was 24 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Sun, Jan 08 1989
Kim So-hyunJang Hye-Sung (young)Kim So-hyun was 14 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Jun 04 1999
Goo Seung-hyunPark Soo-Ha (young)Goo Seung-hyun was 8 in I Hear Your Voice - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Jun 28 2004