He participated in the Jugend Musiziert, a young musicians competition in Germany, at the age of 16. He won the first prize that year and in the following two competitions.

He was then invited to play Beethoven's third piano concerto with the Botosani National Philharmonic Orchestra from Romania in Germany and Romania.

Guo has been on a world tour every summer since 2013, playing for audiences in cities, including Los Angeles, Tokyo, Singapore, Kuala Lumpur and Vancouver.

His ongoing tour in China, from July to October, covers 13 cities, including Beijing, Tianjin, Shaanxi's provincial capital, Xi'an, and Shenzhen in Guangdong province.

The July concert in Guangdong's capital, Guangzhou, drew mostly high school and university students.

Guo "knows his audience well, and he fills a gap in the animation music market", according to the Guangzhou-based Information Times newspaper.

Guo says he used to purchase music scores online as a high school student. They were expensive and stretched his limited pocket money.

Now he wants to share his music with as many people as possible, "all over the world".

In the process, he also wants to continue arousing interest in playing the piano and their appreciation of classical music.

"I hope people can learn to play the piano on their own initiative, instead of just doing it passively."