Rude!

On February 6, 2026, SM Entertainment announced that Hearts2Hearts would be releasing the single "Rude!" on February 20, 2026.^[2] On February 12, a teaser trailer titled "How to Behave When the Heart is Missing" was released.^[3] On February 19, the music video teaser was released.^[4] The song was released alongside its music video on February 20.^[5]

"Rude!" was written by Park Tae-won, Danke, and Lee Hyung-seok, composed and arranged by Sebastian Thott, with Maya Rose and Arineh Karimi contributing to the composition.^[6] It was described as a house-based dance song with lyrics that "expresses the cute rebellion of tomboys who are not bound by established rules".^[7]

"Rude!" debuted at number 129 on South Korea's Circle Digital Chart in the chart issue dated February 15–21, 2026;^[8] on its component charts, the song debuted at number three on the Circle Download Chart,^[9] and number 131 on the Circle BGM Chart.^[10] On the Billboard Korea Hot 100, the song debuted at number 11 in the chart issue dated March 7, 2026.^[11]

In Singapore, the song debuted at number 9 on the RIAS Official Singapore Regional Chart in the chart issue dated February 20–26, 2026.^[12] In Indonesia, the song debuted at number 13 on the ASIRI Official Indonesia Chart in the chart issue dated February 20–26, 2026.^[13] In Hong Kong, the song debuted at number 19 on the Billboard Hong Kong Songs in the chart issue dated March 7, 2026.^[14] In Taiwan, the song debuted at number 11 on the Billboard Taiwan Songs in the chart issue dated March 7, 2026.^[15]

In United States, the song debuted at number ten on the Billboard World Digital Song Sales in the chart issue dated March 7, 2026.^[16] In New Zealand, the song debuted at number 15 on the RMNZ Hot Singles in the chart issue dated February 27, 2026.^[17] Globally, the song debuted at number 80 on the Billboard Global 200 in the chart issue dated March 7, 2026.^[18] It also debuted at number 37 on the Billboard Global Excl. US in the chart issue dated March 7, 2026.^[19]

Hearts2Hearts debuted the song at their first fan meeting titled "Hearts 2 House" on February 21.^[20] They subsequently performed the song at four music programs: Mnet's M Countdown on February 26,^[21] KBS's Music Bank on February 27,^[22] MBC's Show! Music Core on February 28,^[23] and SBS's Inkigayo on March 1.^[24]

• Digital download and streaming – Remixes^[25]

1. "Rude!" (Silly Silky remix) – 3:56
2. "Rude!" (Yunji remix) – 3:11

Credits adapted from Melon.^[6]

Studio

• SM Starlight Studio – recording, digital editing
• SM Dorii Studio – recording
• SM Aube Studio – recording
• SM Wavelet Studio – digital editing, engineered for mix
• SM Concert Hall Studio – mixing
• Klang Studio – mixing in Dolby Atmos
• Sterling Sound – mastering

Personnel

• SM Entertainment – executive producer
• Hearts2Hearts – vocals
• Park Tae-won – lyrics
• Danke – lyrics
• Lee Hyung-seok – lyrics
• Sebastian Thott – composition, arrangement
• Maya Rose – composition, background vocals
• Arineh Karimi – composition, background vocals
• Jsong – vocal directing, background vocals
• Kriz – vocal directing
• Jeong Yoo-ra – recording, digital editing
• Jeong Jae-won – recording
• Kim Hyo-joon – recording
• Kang Eun-ji – digital editing, engineered for mix
• Nam Koong-jin – mixing
• Koo Jong-pil – mixing in Dolby Atmos
• Joe LaPorta – mastering