2023: First concert tour, My World, and Drama
On February 25 and 26, they held their first concert, Synk: Hyper Line, at the Jamsil Arena in Seoul, South Korea. On March 7, the group was announced as a performer at the Outside Lands Music and Arts Festival in San Francisco, California, on August 11, making them the first K-pop group to perform at the festival. From March to April, Aespa continued their Synk: Hyper Line concert tour in Japan, garnering a total of 110,000 spectators from 10 sold-out shows across Osaka, Tokyo, Saitama, and Aichi. During their concert at the Yoyogi National Gymnasium in Tokyo, it was announced that the group would return on August 5 and 6 for a two-day special concert at the Tokyo Dome, making them the fastest K-pop artist and the first "fourth generation" K-pop act to hold a solo concert at the stadium.
On March 29, SM Entertainment announced that Aespa would release a new single titled "Hold on Tight", an "addictive" techno-genre track that sampled the melody of the iconic Tetris theme song, "Korobeiniki", for the soundtrack of the Apple Original Film Tetris. The single officially released on March 31.
On May 8, Aespa released their third extended play My World. The extended play contains six tracks, with the single "Welcome to My World" pre-released on May 2 and the lead single "Spicy" released alongside the EP. My World debuted at number one on the Circle Album Chart with 1,420,178 copies sold. Two weeks after its release, the album became "a double million-seller" selling 2,011,388 copies and became the second album by a female Korean act to sell over two million copies. The album was then certified 2× Million by the Korea Music Content Association on July 6. On the U.S. Billboard 200 chart, My World debuted at number nine with 40,000 album-equivalent units, 1.33 million on-demand streams and 39,000 pure album sales, becoming their second top 10 entry.
On May 10, SM Entertainment announced that Aespa's Synk: Hyper Line tour would continue with a show in Jakarta, Indonesia on June 24. On May 19, an additional 14 shows were announced, extending the tour to North America, South America, and Europe.
On May 23, Aespa attended the 2023 Cannes Film Festival as ambassadors for the Swiss jewelry brand Chopard. They attended Chopard's Annual Dinner and Love Party which showcased Chopard's co-president and artistic director Caroline Scheufele's first Haute couture collection. The next day, Aespa attended the red carpet for the screening of La Passion de Dodin Bouffant and showcased the brand's new jewelry collection, Red Carpet Collection. On June 8, Aespa threw the first pitch for the New York Yankees against the Chicago White Sox at the Yankee Stadium.
On June 10, Aespa performed at the annual Governors Ball Music Festival in New York City, making them the first K-pop act to perform at the festival. Giselle was unable to perform with the group due to health issues. The group's set was well received by both fans and critics alike, with Simon Vozick-Levinson of Rolling Stone calling the show a "spectacle" and Starr Bowenbank of Billboard noting that Aespa's "stage presence and catalog has the strength to carry the main stage at a music festival".
On July 27, Aespa began teasing their English digital single "Better Things", a "minimal up-tempo dance" song, which was released on August 18. Promotions included a 3 episode long web series sitcom show, Better Things, with the first episode uploaded on August 7. Ningning only appeared in limited parts of the sitcom, due to her health conditions at the time of filming. Aespa first performed the single on August 13, at the Crypto.com Arena in Los Angeles, for the first show in the US leg of their Synk: Hyper Line tour.
On August 23, Aespa released the single "We Go". The single served as the inaugural opening theme song for the Korean edition of the Pokémon: Liko and Roy's Departure anime, which began airing on the same day. The single contains lyrics about the new protagonists, Liko and Roy, discovering 'precious' things and growing through adventure.
On October 6, Aespa released the single "Zoom Zoom", which was served as the ending theme song for Beyblade X anime. On October 10, Aespa announced they would be releasing their fourth extended play Drama on November 10. The extended play contains six tracks, including the lead single of the same name.
