Hearts2Hearts: Flutter

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Flutter

a b-side by Hearts2Hearts is featured on the focus album as the fourth track. The song was released on October 20, 2025, with writing, composition and arrangement by Kenzie. No2zcat also participated in composition and arrangement. Andrew Choi and Jsong also helped with composition on the track.

Flutter features members A-na, Carmen, Ian, Jiwoo, Juun, Stella, Ye-on, and Yuha at the average age of 17.4 years old.

Flutter has a total of 246 words with the majority of the song being sung in Korean at 54.1% (133 words) versus 45.9% (113 words) in English. 38 words (15.4%) were sung by all in unison while 208 words (84.6%) were split between the individuals. The average is 26 words with a standard deviation of 11.8 words and a margin of error of 4.2 words. Member Stella has the highest amount of words while member A-na has the least.

Rank
  1. Yuha - 25 words
  2. Stella - 22 words
  3. Ye-on - 21 words
  4. Carmen - 20 words
  5. Juun - 14 words
  6. Jiwoo - 10 words
  7. Ian - 8 words
  8. A-na - 5 words
Yuha- Highest Word Count 

Flutter has a total track time of 3 minutes and 5 seconds and with a total singing time of 2 minutes and 40 seconds which is about 86% of the track. 21.9% (35 seconds) of Flutter is sung in unison with 78.1% (125 seconds) is split between the eight members. The average is 15.6 seconds with a standard deviation of 6.9 seconds and a margin of error of 2.4 seconds. Member Yuha had the highest amount of time while member A-na had the least.


Rank
  1. Stella - 45 seconds
  2. Yuha - 36 seconds
  3. Carmen - 33 seconds
  4. Juun - 28 seconds
  5. Jiwoo, Ye-on - 24 seconds
  6. Ian - 11 seconds
  7. A-na - 7 seconds
Stella - Highest Time Count 

Flutter as a b-side was not up for any music show awards nor was it up for nominations during the award season cycle. The song did place on the South Korea circle download chart peaking at #76.

Flutter by Hearts2Hearts earned a total of 398 points and earned a B+ For word distribution and a grade of A for time distribution.

Points Breakdown
  • Standard Deviation: 181.3 points
  • Margin of Error: 193.4 points
  • Music Show: 0 points
  • Awards: o points
  • Charts: 24 points

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