Claims surrounding a Haewon 20-hour schedule have circulated under the broader Haewon Overwork Controversy, but the available source material does not confirm a specific 20-hour workday for the NMIXX member. What is documented is NMIXX’s compressed May 2026 comeback activity around the group’s fifth EP, ‘Heavy Serenade,’ including its release, promotional schedule, music show rollout, and early performance indicators.
JYP Entertainment announced through NMIXX’s official website that the group’s fifth EP, ‘Heavy Serenade,’ was released on May 11, 2026, with links provided to major music platforms including Melon, FLO, Genie, Bugs, VIBE, YouTube Music, and Spotify.1 The confirmed record therefore supports a schedule-heavy comeback week, but it does not establish the specific overwork claim implied by the phrase “20-hour schedule.”
What Is Confirmed About Haewon’s Schedule Context

The clearest timeline begins before release day. Star News reported that JYP Entertainment posted a promotional scheduler through official social media on April 14, confirming NMIXX’s May 11 comeback. The rollout was set to begin on April 21 with album trailers, a tracklist, concept photos, and a highlight medley released in sequence before the album launch.2
The same report stated that NMIXX planned a countdown live at 4:40 p.m. on May 11, followed by the release of the album and title track music video at 6 p.m. that day.2 Those details show a structured release-day schedule, but they do not specify Haewon’s individual working hours, rest time, rehearsal length, or transportation schedule.
Korea JoongAng Daily reported that NMIXX returned with ‘Heavy Serenade’ at 6 p.m. on May 11, 2026, describing the EP as the group’s first release in about seven months after the October 2025 full-length album ‘Blue Valentine.’3 The report also said the new EP contains six tracks.3 That timing places the comeback in a standard album-cycle frame rather than providing independent evidence of a single-day workload claim.
Haewon was quoted in coverage describing the concept of the release, saying, “Through Heavy Serenade, we’re singing about love carried by a heart that feels heavy and unwavering.”3 iMBC Entertainment also cited Haewon as saying the music would be “mysterious and fun,” mixing electronic music and pop.4 These remarks relate to the album’s musical direction, not to working conditions or controversy.
Heavy Serenade Release and Music Show Rollout
The EP’s contents are more clearly documented than the disputed schedule claim. iMBC Entertainment reported that ‘Heavy Serenade’ was released on May 11 and that NMIXX began comeback promotions with the album. The track list included the title track as well as ‘Crescendo,’ ‘IDESERVEIT,’ ‘Different Girl,’ ‘Superior,’ and ‘LOUD,’ for a total of six songs.4
The same report noted that members Lily and Bae participated in lyric writing.4 That detail is relevant to the comeback’s creative profile, while the source material provided for this article does not name Haewon as a lyricist on the EP.
The music broadcast schedule began later in the same week. ChosunBiz, carrying an OSEN report, said NMIXX started music show activities on May 14 with Mnet’s ‘M Countdown’ and would continue through KBS2’s ‘Music Bank,’ MBC’s ‘Show! Music Core,’ and SBS’s ‘Inkigayo.’5 That sequence indicates a multi-program promotion cycle beginning three days after the album release.
The May 14 report also said ‘Heavy Serenade’ ranked No. 13 on Melon Top 100 as of midnight on May 14.5 Separately, Sports DongA reported that JYP Entertainment released behind-the-scenes images from the ‘Heavy Serenade’ music video on May 13. The report said the music video reached No. 2 on YouTube’s worldwide music video trending chart on its release day and surpassed 10 million views by the morning of May 13.6
Those performance figures help explain the public attention around the comeback period. They still do not verify a 20-hour schedule for Haewon or any other member.
Why the 20-Hour Claim Remains Unconfirmed Here
The available materials support several concrete facts: the comeback was announced on April 14, teaser promotions began on April 21, ‘Heavy Serenade’ was released on May 11 at 6 p.m., the album includes six tracks, and music show promotions began on May 14. They also support early commercial and visibility indicators, including a Melon Top 100 position and YouTube music video traction.
However, none of the provided sources confirms the central claim of a 20-hour work schedule. The sources do not include a staff statement, agency response, broadcast log, member schedule disclosure, labor complaint, or direct quote from Haewon about working for 20 hours. Because the topic involves potential overwork, that distinction matters: a busy comeback calendar can be documented without proving the exact duration or conditions of an individual member’s workday.

For now, the source-backed account is narrower than the controversy label suggests. NMIXX carried out a documented May 2026 comeback for ‘Heavy Serenade,’ with release-day activity, staged promotional content, music show appearances, and measurable early attention. The specific Haewon 20-hour schedule claim remains unverified within the provided record.
References
- NMIXX 5th EP <Heavy Serenade> 발매 안내 (JYP Entertainment, 2026-05-11)
- 엔믹스, '헤비 세레나데' 부른다..5월 11일 컴백 확정 (스타뉴스, 2026-04-14)
- Girl group NMIXX to return with EP 'Heavy Serenade' after success of 'Blue Valentine' (Korea JoongAng Daily, 2026-05-11)
- 엔믹스, 봄 감성 품은 '헤비 세레나데'…"사랑의 무게 담았다" (iMBC연예, 2026-05-11)
- NMIXX, 청초하게 피어난 비주얼 꽃…'Heavy Serenade' 무대 공개 (조선비즈/OSEN, 2026-05-14)
- 엔믹스, ‘헤비 세레나데’ MV 비하인드 컷 공개…청량+몽환 매력 (스포츠동아, 2026-05-13)