Hayato Sumino, the Todai Engineer Turned Piano Phenomenon, Plays Seoul's Lotte Concert Hall

Hayato Sumino, the Japanese pianist who livestreamed his own practice sessions during the 2021 Chopin International Piano Competition, brings his recital to Seoul's Lotte Concert Hall on Oct. 29. The hall sits inside Lotte World Tower in Jamsil, Songpa-gu, and the show marks one of the few Korean stops this season for a performer whose career has moved from a graduate engineering lab in Tokyo to arena stages that classical piano rarely fills.

Sumino finished his master's degree at the University of Tokyo's Graduate School of Information Science and Technology in March 2020, taking the university's President's Award for his research. His undergraduate work focused on sound source separation, and his graduate research trained machine learning systems to transcribe and arrange music by ear, a project that took him to Paris for roughly six months at IRCAM, the Institut de Recherche et Coordination Acoustique/Musique, according to an interview he gave the Japanese music site RealSound. The detail complicates the tidy version of his story in which a university engineer wandered into classical music. His engineering research was already about modeling music, which makes the move to the concert stage less a break from his field than an extension of it.

The turning point most often cited in his own telling came earlier than the Chopin competition. In 2018, while still a graduate student, Sumino won the Grand Prix in the Special Stage of the 42nd PTNA Piano Competition, a result that pushed him toward performing full time even as he finished his thesis. He placed third at the Lyon International Piano Competition in 2019, completed his degree in 2020, and advanced to the semifinal round of the Chopin competition in Warsaw in 2021, the credential that introduced him to Western classical audiences and anchors most profiles written about him since.

What those profiles tend to undersell is the scale of the audience he had already built before Warsaw. Under the name Cateen, Sumino runs a YouTube channel with more than 1.3 million subscribers and upward of 180 million views, built on virtuosic improvisations and arrangements of video game and anime music, long before judges in Poland ever heard him play. His second round performance at the Chopin competition drew as many as 45,000 live viewers on YouTube, a number that startled a classical world accustomed to treating him as a novelty act who happened to play well.

That novelty framing has not held up. In July 2024, Sumino sold out Nippon Budokan, the Tokyo arena better known for rock and pop concerts, drawing roughly 13,000 people and setting an attendance record for a classical pianist there. He went further in November 2025, setting a Guinness World Record for the most tickets sold for an indoor solo piano recital when more than 18,500 people attended his "Klassik Arena" show at K-Arena Yokohama, according to The Violin Channel. The program that night paired Bach and Beethoven's "Moonlight" Sonata with his own arrangement of Saint-Saens' "Danse macabre" and etudes by Nikolai Kapustin, the same mix of canon and crossover repertoire that defines his recitals generally.

The classical establishment has caught up with the numbers. Sumino signed as an exclusive Sony Classical artist in March 2024, released a debut album spanning Bach, Debussy and Faure alongside his own Ravel arrangement, and is booked for his Carnegie Hall recital debut this season along with an orchestral debut there with the Philadelphia Orchestra under Marin Alsop. The Schleswig-Holstein Musik Festival gave him its Leonard Bernstein Award in 2025, and Germany's Rheingau Musik Festival has named him artist in residence for 2026, with seven concerts including the festival's opening performance.

For Seoul audiences, the practical details are still filling in. Lotte Concert Hall has confirmed the Oct. 29 date but had not published ticket prices, seating tiers or a box office window as of Oct. 14, when this listing was checked. Bookings for the venue typically run through its own website and through Interpark Ticket, the two channels the hall uses for its classical season, and a program for the evening has not yet been released. Concertgoers checking for updates will find the same artist who once answered fan questions in a YouTube live chat window now filling a 2,000 seat hall built for exactly this kind of evening.