In-Sung Sim was born in South Korea.

Recently the artist has performed Lodovico/Otello at Tokyo Bunka Kaikan, Filipp II/Don Carlo, Fiesco/Simon Boccanegra and Le bailli/Werther in Tel Aviv, Wurm/Luisa Miller and Lodovico/Otello at Opéra de Monte-Carlo, Ramfis/Aida at Festival de Sanxay in France, Timur/Turandot at Teatro Comunale di Bologna, Lodovico/Otello with ROH Covent Garden London and Pappano on Tour to Japan and in London, Ramfis/Aida at Fondazione Arena di Verona, Ferrando/Il Trovatore and Bonzo/Madama Butterfly at Teatro Regio di Torino, Banco/Macbeth in Toulouse, Sarastro/Die Zauberflöte with Komische Oper Berlin on Tour to Japan and also Australia and New Zealand.

Future highlights among others include Principe di Bouillon/Adriana Lecouvreur at Teatro Petruzelli di Bari, Verdi's Requiem at Opera Philadelphia in USA, Raimondo/Lucia di Lammermoor and Il Re/Aida with Noseda and Robert Carsen at Royal Opera House Covent Garden and Banco/Macbeth in Santiago. 

Other past performances in recent years include Padre Guardiano/La Forza del Destino in Las Palmas, Alvise/La Gioconda at Malmö Opera, Phorbas/Oedipe with Maestro Jurowski at London Philharmonic Orchestra, Verdi Requiem with Fabio Luisi and DR Symfoniorkester, Banco/Macbeth in Teatro Municipale Salerno, Phorbas/Oedipe, Sarastro/Die Zauberflöte, Colline/La bohème, Timur/Turandot and Lodovico/Otello (with Pappano) at Royal Opera House Covent Garden in London, Oroveso/Norma in Essen, La Wally, telAttila and Maria Stuarda at Opéra de Monte-Carlo, Sarastro/Die Zauberflöte, Timur/Turandot and Re/Aida at Teatro Regio di Torino (w. Noseda), Wurm/Luisa Millerat Teatro Verdi di Trieste, Matthäus Passion with Copenhagen Royal Chapel Choir, Fafner/Siegfried in Tokyo, Zaccaria/Nabucco at Festival di Caserta, Zaccaria/Nabucco, Commendatore/Don Giovanni and Il Re/Aida in Arena di Verona, Timur/Turandot in Toulouse, Sarastro/Die Zauberflöte and Raimondo/Lucia di Lamermoor in Teatro Fialrmonico di Verona, Hunding/Walküre in Tokyo, Nourabad/Les Pêcheurs de Perles and Zaccaria/Nabucco (with Daniel Oren) in Tel Aviv, Sarastro/Zauberflöte with Ottavio Dantone and Marchese di Calatrava/La Forza del Destino with Zubin Mehta at Palau de Les Arts de Valencia, Il Commendatore/Don Giovanni in Montpellier, Die Legende von der Heiligen Elisabeth by F. Liszt at Staatsoper Stuttgart, Rocco/Fidelio at The New Opera in Bergen, Ramfis/Aida and Sarastro/Die Zauberflöte in Santiago, Il Commendatore/Don GiovanniTimur/Turandot at Puccini Festival di Torre del Lago, Sparafucile/Rigoletto in Kristiansand and others.

His 2012-13 season took him to his debut at the National Theater Mannheim, where he sang the role off Fafner and Sarastro. He visited Opera Monte Carlo in the role of Count Rodolfo in La Sonnambula by Bellini. Furthermore, Mr. Sim was seen at Teatro Municipal de Santiago, where he sang the title role of Attila and the role of Papa Leon in Attila by Verdi.

In 1996, he was awarded first prize in the KBC competition in Korea. From 1998 to 1999, and he finished his studies of singing at the Vienna Conservatory. In July 2000, he was awarded two special prizes in the Belvedere competition. In-Sung Sim has won a number of other competitions, including those in Los Angeles and Oslo. Lieder recitals have taken the singer e.g. to the Marseille Opera and the Avignon Opera.

In 2001, he debuted at the Vienna State Opera, where he sang the roles of the Steuermann, Swallow in Benjamin Britten's Peter Grimes, and the Geisterbote in Richard Strauss' Die Frau ohne Schatten, as well as speaking roles, the Second Priest in The Magic Flute, Dulcamara, Don Fernando, Raimondo and Capulet, among others. In-Sung Sim has also debuted in the roles of Brétigny in Puccini's Manon Lescaut, Klingsor, Roucher in Giordano's Andrea Chénier and Silva in Verdi's Ernani. 

The young bass In-Sung Sim appeared as a guest during the 2007-2008 season at such internationally known opera houses as the Teatro Verdi in Trieste, the Vienna State Opera and the Teatro Carlo Felice in Genova. He made his debut at the Salzburg Festival in 2008 in the role of Capulet in Gounod's Roméo et Juliette. 

In the seasons 2008-2010 Mr. Sim has been singing at important venues such as Montpellier Festival, Tokyo Opera Nomori, Teatro Massimo di Palermo, Hongkong Opera and at Glynbourne and Vendee Festival, where he has been captivating audiences in the roles of Pimen in Boris Godunov, Commendatore in Don Giovanni and Don Quichotte. In the role as Gustavo in Faramondo he has been visiting the Lausanne Opera, the Opera de Vichy, the Théàtre du Champs Elysees and the Théàtre du Caen. Other roles has been Timur in Puccini's Turandot at the Savonlinna Festival, Dulcamara at the Seoul Opera, Sparafucile at Teatro Carlo Fenice di Genova and Glendower in the opera Merlin at Kissinger Festspiele. 

In March 2012 Mr. Sim appeared as Timur/Turandot with Trondheim Symphony Orchestra.

He has also sung in CD productions of Parsifal and Tristan und Isolde for the Deutsche Grammophon label and the CD recording of Handel's opera Faramondo for EMI/Virgin Classics and also Handel's Alessandro where he performed the role of Clito.

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