Smart (song)

On January 22, 2024, Source Music announced that Le Sserafim would be releasing their third extended play, Easy, on February 19. On February 7, five track sampler videos were released. A day later, the track listing was released, with "Smart" confirmed as a song on the album. The music videos teaser was released on March 4 and the music video was released the following day, on March 5. On March 20, it was announced that an English version and remixes of the song would be released on March 22.

"Smart" was written and produced by Score and Megatone of the production collective 13, with Supreme Boi, Arineh Karimi, BB Elliot, Zzz, "Hitman" Bang, Paige Garabito, Jasmin Lee Maming, Teodor Herrgårdh, Hadar Adora, Charli, Lee Eun-hwa, and Le Sserafim member Huh Yunjin participating in the writing. The song was described as an Afropop-inspired Amapiano song. "Smart" was composed in the key of C-sharp major, with a tempo of 113 beats per minute.

The music video directed by Yong Seok Choi was released by Source Music on March 5, 2024. In the video, the members "[perform] the song's accompanying choreography in the middle of a large, empty warehouse adorned with numerous large tapestries of art hung from the ceiling and on the walls."

• Digital download and streaming, remixes

1. "Smart", 2:46
2. "Smart" (English version), 2:46
3. "Smart" (smartest remix), 2:56
4. "Smart" (chill remix), 2:42
5. "Smart" (Miami bass remix), 2:15
6. "Smart" (festival house remix), 2:25
7. "Smart" (sped up version), 2:09
8. "Smart" (slowed + reverb remix), 3:55
9. "Smart" (instrumental), 2:46

Adapted from the album liner notes.

• Le Sserafim, lead vocals
• Score (13), production, keyboards, drums digital editing, vocal arrangement
• Megatone (13), production, bass, guitar, digital editing, vocal arrangement
• Arineh Karimi, background vocals
• Jasmine Lee Maming, background vocals
• Jordan "DJ Swivel" Young, mix engineering
• Chris Gehringer, mastering
• Hwang Min-hee, engineering
• Lee Yeon-soo, engineering