The Boyz berpartisipasi di ''[[Kingdom: Legendary War|Kingdom]]'', sejak April 2021, dan mendapatkan peringkat kedua.<ref>{{cite news |last1=Kim |first1=Eun-ae |title=[단독] 비투비·아이콘·SF9, '킹덤' 출연 최종확정..왕좌 쟁탈전 펼친다 |url=https://n.news.naver.com/entertain/article/109/0004345647 |access-date=March 1, 2021 |work=Naver |agency=Osen |publisher=Naver |date=January 28, 2021 |language=ko}}</ref>
Pada 11 Juli, The Boyz merilis singelsingle promosi "Drink It" melalui [[Universe (platform)#Universe Music|Universe Music]] untuk aplikasi seluler [[Universe (platform)|Universe]].<ref>{{cite news|last1=Lee|first1=Se-ul|title=더보이즈, 11일 'Drink It' 발매…오늘(2일) 스케줄러‧커버 이미지 공개|url=https://entertain.naver.com/now/read?oid=311&aid=0001317993|access-date=July 2, 2021|work=Naver|agency=Xports News|publisher=Naver|date=July 2, 2021|language=ko}}</ref>
Pada 9 Agustus, The Boyz kembali dengaan album mini keenam mereka ''[[Thrill-ing]]'' dengan singelsingle utama "Thrill Ride".<ref>{{cite news|last1=Park|first1=Soo-in|title=더보이즈, 8월9일 ‘스릴링’으로 컴백 ‘11개월 만 신보’|url=https://entertain.naver.com/now/read?oid=609&aid=0000472151|access-date=July 26, 2021|work=Naver|agency=Newsen|publisher=Naver|date=July 26, 2021|language=ko}}</ref> Mereka meraih lima kemenangan acara musik di [[SBS MTV]] [[The Show (seri televisi Korea Selatan)|The Show]], [[MBC M]] [[Show Champion]], [[Mnet]] [[M Countdown]], [[KBS2]] [[Music Bank (seri televisi)|Music Bank]], dan [[MBC TV|MBC]] [[Show! Music Core]].<ref>{{Cite web|last=Kim|first=Soo-hyung|date=August 17, 2021|title="더초이스 더비♥덕분" 더보이즈, '더쇼' 출연하자마자 1위‥웰컴백 [종합]|url=http://osen.mt.co.kr/article/G1111636614|url-status=live|access-date=October 31, 2021|website=OSEN|archive-date=October 31, 2021|archive-url=https://web.archive.org/web/20211031161304/http://osen.mt.co.kr/article/G1111636614}}</ref><ref>{{Cite web|last=Ha|first=Ji-won|date=August 18, 2021|title='쇼챔' 더보이즈, 컴백과 동시에 1위…"더비들 덕분" [종합]|url=https://www.xportsnews.com/?ac=article_view&entry_id=1462830|url-status=live|access-date=October 31, 2021|website=xsportsnews.com|archive-date=October 31, 2021|archive-url=https://web.archive.org/web/20211031161305/https://www.xportsnews.com/?ac=article_view&entry_id=1462830}}</ref><ref>{{Cite web|last=Park|first=Seohyun|date=August 20, 2021|title=더보이즈, '엠카' 1위 등극..음방 3관왕 돌파→트로피 사냥ing|url=http://pop.heraldcorp.com/view.php?ud=202108200903586552832_1|url-status=live|access-date=October 31, 2021|website=pop.heraldcorp.com|archive-date=October 31, 2021|archive-url=https://web.archive.org/web/20211031161305/http://pop.heraldcorp.com/view.php?ud=202108200903586552832_1}}</ref><ref>{{Cite web|last=Lee|first=Deok-haeng|date=August 21, 2021|title=더보이즈, 'THRILL RIDE'로 데뷔 첫 공중파 1위…"앞으로 더 열심히 할 것"|url=https://star.mt.co.kr/stview.php?no=2021082109075216962|url-status=live|access-date=October 31, 2021|website=star.mt.co.kr|archive-date=October 31, 2021|archive-url=https://web.archive.org/web/20211031161305/https://star.mt.co.kr/stview.php?no=2021082109075216962}}</ref><ref>{{Cite web|last=Ko|first=Seung-ah|date=August 23, 2021|title=더보이즈, 음악방송 5관왕 등극…"잊지 않고 더 성장하겠다"|url=https://www.news1.kr/articles/?4410854|url-status=live|access-date=October 31, 2021|website=News1 Korea|archive-date=November 1, 2021|archive-url=https://web.archive.org/web/20211101002852/https://www.news1.kr/articles/?4410854}}</ref>
Pada 17 September, [[Kakao Entertainment]] mengumumkan bahwa agensi The Boyz, [[Cre.ker Entertainment]] dan [[Play M Entertainment]], akan bergabung untuk meluncurkan label baru yang terintegrasi.<ref>{{Cite web|last=Lee|first=Min-ji|date=September 17, 2021|title=플레이엠X크래커 합병, 에이핑크→더보이즈 한솥밥(공식)|url=https://www.newsen.com/news_view.php?uid=202109170940150010|url-status=live|access-date=October 31, 2021|website=Newsen|archive-date=October 31, 2021|archive-url=https://web.archive.org/web/20211031161303/https://www.newsen.com/news_view.php?uid=202109170940150010}}</ref>
New dan Q menjadi DJ di KBS Cool FM 'STATION Z' yang disiarkan tengah malam setiap Minggu mulai 10 Oktober selama empat minggu.<ref>{{Cite web|last=Gong|first=Mi-na|date=October 7, 2021|title=더보이즈 뉴·큐, '스테이션 제트' DJ 발탁 "MZ세대 청취자와 소통"[공식]|url=https://star.mt.co.kr/stview.php?no=2021100715444787249|url-status=live|access-date=October 31, 2021|website=star.mt.co.kr/|archive-date=October 31, 2021|archive-url=https://web.archive.org/web/20211031161303/https://star.mt.co.kr/stview.php?no=2021100715444787249}}</ref>
Pada 1 November, The Boyz kembali dengan album singelsingle ketiga mereka ''Maverick'' dengan singelsingle utama dengan judul yang sama.<ref>{{cite news|last=Kim|first=Ye-na|title=더보이즈, 11월 1일 컴백…"초고속 신곡 활동" [공식입장]|url=https://n.news.naver.com/entertain/now/article/311/0001360284|access-date=October 15, 2021|work=Naver|agency=Xports News|publisher=Naver|date=October 15, 2021|language=ko|archive-date=October 15, 2021|archive-url=https://web.archive.org/web/20211015003141/https://n.news.naver.com/entertain/now/article/311/0001360284|url-status=live}}</ref>
Pada 6 Desember, The Boyz merilis singelsingle digital berjudul "Candles" untuk memperingati hari jadi keempat mereka.<ref>{{cite news|last=Jeong|first=Hee-yeon|title=더보이즈, 6일 스페셜 싱글 '캔들스(Candles)' 발표|url=https://n.news.naver.com/entertain/now/article/382/0000948494|access-date=December 2, 2021|work=Naver|agency=Sports Donga|publisher=Naver|date=December 2, 2021|language=ko|archive-date=December 2, 2021|archive-url=https://web.archive.org/web/20211202034236/https://n.news.naver.com/entertain/now/article/382/0000948494|url-status=live} </ref>
== Anggota ==
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