In the following years, he performed many important works in Korea, including several local premieres such as Mussorgsky's Pictures at an Exhibition.

Later he studied in New York (Juilliard School), London, and Italy with Rosina Lhévinne, Ilona Kabos, Guido Agosti and Wilhelm Kempff.

Kun-Woo Paik is also a regular guest artist at major music festivals such as the Berlin Festwochen, Aix-en-Provence, La Roque-d'Anthéron, Colmar, Spoleto, Aldeburgh, "Mostly Mozart" and Ravinia Festivals, and has toured extensively in Australia, New Zealand, Asia and Italy.

Kun-Woo Paik also performs a wide selection of transcriptions by Liszt and Berlioz and is the dedicatee of Suk-Hi Kang's piano concerto.

Yoon is a star of the late 1960s, commonly referred to as one of "The First Troika" by the South Korean news media, along with two other actresses in rivalry, Moon Hee, and Nam Jeong-im.