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== Latar belakang dan Perilisan ==
Pada 22 Desember 2021, IST Entertainment mengumumkan Apink akan merilis album baru pada Februari 2022. <ref>{{Cite web|last=Kim|first=No-eul|date=December 22, 2021|title=에이핑크 측 "손나은 포함 완전체 2월 컴백, 앨범 형태 미정" [공식입장]|url=https://entertain.naver.com/read?oid=311&aid=0001388495|publisher=X-port News|language=ko|trans-title=Apink side "Feb comeback with Son Na-eun, album form undecided" [Official position]|archive-url=https://web.archive.org/web/20220214133618/https://entertain.naver.com/read?oid=311&aid=0001388495|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Pada tanggal 18 Januari 2022, [[YG Entertainment]] mengumumkan bahwa anggota [[Son Na-eun]] tidak akan berpartisipasi dalam kegiatan promosi album kecuali syuting untuk jaket album dan video musik karena "kesulitan dalam mengoordinasikan jadwal untuk proyek berikutnya". <ref>{{Cite web|last=Jeong|first=Hee-yeon|date=January 18, 2022|title=손나은, 에이핑크 컴백 활동 불참 "차기작 협의" (전문) [공식]|url=https://entertain.naver.com/read?oid=382&aid=0000956924|publisher=Sports Donga|language=ko|trans-title=Son Na-eun, Apink's comeback absence "Consultation for next project" (Full text) [Official]|archive-url=https://web.archive.org/web/20220214133621/https://entertain.naver.com/read?oid=382&aid=0000956924|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Pada 22 Januari, diumumkan bahwa Apink akan merilis ''HornHORN'' pada 14 Februari. <ref>{{Cite web|last=Kim|first=Ji-hye|date=January 22, 2022|title=에이핑크, 2월 14일 컴백 확정..스페셜 앨범 'HORN' 발표(공식)|url=https://entertain.naver.com/read?oid=112&aid=0003523795|publisher=Herald Pop|language=ko|trans-title=Apink, February 14 comeback confirmed..Special album 'HORN' released (official)|archive-url=https://web.archive.org/web/20220214133621/https://entertain.naver.com/read?oid=112&aid=0003523795|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Album ini dipasarkan sebagai "album spesial" oleh IST Entertainment. <ref>{{Cite web|date=January 21, 2022|title=Apink Special Album [HORN]|url=https://www.instagram.com/p/CY_qRbIvxOY/|publisher=official.apink2011|archive-url=https://web.archive.org/web/20220214133620/https://www.instagram.com/accounts/login/?next=/p/CY_qRbIvxOY/|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Empat hari kemudian, Apink merilis daftar lagu yang terdiri dari 11 lagu termasuk singel "Thank You" yang dirilis satu tahun sebelumnya dan singel utama "Dilema" dirilis. <ref>{{Cite web|last=Kim|first=Myung-mi|date=January 26, 2022|title='컴백' 에이핑크, 타이틀곡은 '딜레마'...스페셜 앨범 트랙리스트 공개|url=https://entertain.naver.com/read?oid=609&aid=0000537050|publisher=Newsen|language=ko|trans-title='Comeback' Apink, title song 'Dilemma'...Special album track list released|archive-url=https://web.archive.org/web/20220214133620/https://entertain.naver.com/read?oid=609&aid=0000537050|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Pada tanggal 7 Februari, video teaser medley highlight dirilis. <ref>{{Cite web|last=Hwang|first=Hye-jin|date=February 8, 2022|title='컴백' 에이핑크, 신곡 '딜레마' 포함 전곡 하이라이트 메들리 공개|url=https://entertain.naver.com/read?oid=609&aid=0000540163|publisher=Newsen|language=ko|trans-title='Comeback' Apink unveils highlight medley of all songs including new song 'Dilemma'|archive-url=https://web.archive.org/web/20220214133630/https://entertain.naver.com/read?oid=609&aid=0000540163|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Teaser video musik untuk "Dilemma" dirilis pada 11 dan 13 Februari. <ref>{{Cite web|last=Kwak|first=Hyeon-su|date=February 14, 2022|title=에이핑크, 신곡 '딜레마' MV 티저 공개...4연속 히트 예고|url=https://entertain.naver.com/read?oid=052&aid=0001701659|publisher=YTN|language=ko|trans-title=Apink releases new song 'Dilemma' MV teaser...4th consecutive hit notice|archive-url=https://web.archive.org/web/20220214133630/https://entertain.naver.com/read?oid=052&aid=0001701659|archive-date=February 14, 2022|access-date=February 14, 2022|url-status=live}}</ref> Dan video musik resmi lagu tersebut dirilis bersamaan dengan albumnya pada tanggal 14 Februari.
== Promosi ==
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