[2] He was a guest on the classic American game show, I've Got a Secret, hosted by Steve Allen.

Han's secret was that, as a young child, he was discovered by Staff Sergeant JJ "Mike" Egan during the Korean War, and General Samuel E. Anderson arranged a tour at the US bases in Japan where they raised money for the young child.

The conductors with whom he had collaborated include Bernard Haitink, Herbert Blomstedt, Edo de Waart, Rafael Frühbeck de Burgos, Charles Dutoit, Lukas Foss, Eugen Jochum, Raymond Leppard, Robert Shaw, Stanisław Skrowaczewski, and David Zinman.

Han's several recordings include Chopin's Twenty-Four Preludes, Four Ballades and Four Scherzos, eight Sonatas by Beethoven (including the last five), Sonatas by Schubert and Brahms, and a group of shorter piano works under the title "Music I Love To Play".

He also has recorded Sonatas for Cello and Piano by Brahms, and Schumann's Fantasy Pieces with cellist Leslie Parnas.