Yun-Yang Lee was born in Taichung City and began studying piano at the age of six. He attended Guangfu Elementary School and Shuangshi Junior High School's music program before becoming a student in the inaugural class of the National Tainan University of the Arts' Music Department. At 17, he was accepted into the prestigious Conservatoire National Supérieur de Musique de Paris (CNSM de Paris) with top marks, majoring in piano. After graduating with distinction in piano and chamber music performance from the Formation Supérieure program, he continued their advanced studies in the third cycle (Cycle de Perfectionnement) specializing in piano and chamber music performance. Additionally, he pursued the Diplôme d’Artiste Interprète at the third cycle level, focusing on chamber music.

Throughout his education, he studied under many renowned pianists and professors, including Zhang Zhe, Albert Mühlböck, Charles Lilamand, Theodor Paraschivesco, Laurent Cabasso, Jean Mouillière, Alain Meunier, Zhu Xiaomei, Michel Strauss, and Vladimir Mendelssohn.

Lee has received numerous awards in both domestic and international piano competitions. His accolades include first prizes in the Youth Category of the Taiwan Provincial Music Competition, the Yamaha National Piano Competition, the 7th International Chinese Chopin Piano Competition (Youth Category), and the Hsing-tian Temple Music Award (Adult Category). He has also won first prize in France at the Brest International Piano Competition, Forum de Normandie Piano Competition, FLAME International Piano Competition, the fifth Mayenne International Piano Competition, the Ile-de-France International Piano Competition, Gold Medal at the inaugural Virtuoses du Cœur Piano Competition, and the Czerny International Piano Competition in Prague; second prize at the Concours Spedidam - Nuits Pianistiques International Piano Competition, third prize at the Maria Canals International Piano Competition in Barcelona, the second Takamatsu International Piano Competition in Japan, the Jean Françaix International Piano Competition in France. In 2007, he received the Chimei Arts Award and was selected for the third and fourth sessions of the Music Talent Pool training program in 2008 and 2009.

During his studies, he performed at the Zofin Palace's Great Hall and the Rudolfinum in Prague with the Virtuosi di Praga orchestra. He was invited to the 4th Pontes International Music Festival in Prague and has given solo recitals in major cities across France and at the Bösendorfer Hall in Vienna. He has also performed with the Essen Philharmonic Orchestra at the Aalto Theatre in Germany, with the concert broadcast live by ZDF and 3Sat. In addition to his performances across Taiwan, he is a regular participant in numerous French music festivals such as the Chopin Piano Festival in Paris, the Journées Ravel Festival, Lundis Musicaux Festival in Camaret-sur-mer, Piano in Saintonge Festival and the Piano in Mayenne Festival. In 2007, he was invited to perform at the Peter the Great Festival in the Netherlands and served as a guest professor of chamber music at the festival's Summer Academy. In 2010, he performed in the Bon anniversaire Monsieur Chopin series, commemorating Chopin's 200th birthday, which was broadcast by France Télévisions. He frequently performs chamber music and concertos across Europe, Canada, and Japan. In 2018, he was invited to perform Ravel's Piano Concerto in G Major with the Evergreen Symphony Orchestra at the National Concert Hall in the "Classical and Impressionistic Journey" concert. He has also been invited to give masterclasses at the National Taipei University of the Arts, the National Tainan University of the Arts, and the Leggiero International Piano Academy.

Lee has a deep passion for chamber music, performing regularly at festivals such as Musique de Chambre à Giverny and Journées musicales entre Loir et Loire. He has extensive experience as a piano accompanist, collaborating with numerous music academies and competitions, including the Long-Thibaud International Violin Competition, the Bellan International Music Competition, the Flame International Music Competition, the Cagliari International Music Academy in Italy, and the Hourtin Music Academy in France.

A German newspaper described him as follows: "Yun-Yang Lee possesses a unique and distinctive style and expression, coupled with exceptional and refined technique, achieving a state of freedom and ease."

Yun-Yang Lee currently holds positions as a full-time piano accompanist at the Conservatoire National Supérieur de Musique et de Danse de Paris (CNSMDP), the Conservatoire à Rayonnement Régional de Paris (CRR de Paris), and the Conservatoire à Rayonnement Régional de Versailles (CRR de Versailles).