His future engagements include Sarastro Die Zauberflöte at Teatro Filarmonico di Verona, Phorbas Oedipe by Enescu, Timur Turandot and Lodovico Otello with Pappano at Royal Opera House Covent Garden in London, Oroveso Norma in Essen, Re Aida at Teatro Regio di Torino w. Noseda, La Wally, Attila and Maria Stuarda at Opéra de Monte-Carlo, Fafner Siegfried in Tokyo, Pilippo II Don Carlo and Nourabad Les Pêcheurs de Perles in Tel Aviv, Banco Macbeth in Toulouse, Wurm Luisa Miller at Teatro Verdi di Trieste, Matthäus Passion with Copenhagen Royal Chapel Choir, Alvise La Gioconda at Malmö Opera, Ramfis Aida in Santiago, Padre Guardiano La Forza del Destino in Las Palmas.

His recent engagements include Commendatore Don Giovanni and Il Re Aida in Arena di Verona, Timur Turandot in Toulouse, Raimondo Lucia di Lamermoor in Teatro Fialrmonico di Verona, Hunding Die Walküre in Tokyo, Zaccaria Nabucco with Daniel Oren in Tel Aviv, Sarastro Die 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 Stuttgart ton Halle, Rocco Fidelio at The New Opera in Bergen, Sarastro Die Zauberflöte in Santiago and in Teatro Regio di Torino including Il Commendatore Don Giovanni, Timur 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 of 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 studied 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 Swallow in Benjamin Britten‘s Peter Grimes, and the Geisterbote in Richard Strauss‘ Die Frau ohne Schatten, as well as Sprecher in Die Zauberflöte, Dulcamara L'elisir d'Amore, Don Fernando Fidelio, Raimondo Lucia di Lammermor and Capulet Roméo et Juliette, among others. In-Sung Sim has also debuted in the roles of Brétigny in Massenet‘s Manon Lescaut, Klingsor Parsifal, 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 and at Glynbourne and Vendee Festival, where he has been captivating audiences in the roles of Pimen in Boris Godunov, Commendatore in Don Giovanni. 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 L'elisir d'Amore at the Seoul Opera 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 by Decca where he performed the role of Clito.