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===2020: ''In Its Time'', ''Road to Kingdom'', ''Lived'', dan "Bbusyeo"===
Pada 10 Januari, Oneus menggelar jumpa penggemar untuk merayakan hari jadi pertama mereka yang bertajuk ''Oneus 1st Anniversary 'Our Moment''' di Yes 24 Live Hall Seoul.<ref>{{Cite web|url=https://n.news.naver.com/entertain/article/009/0004498645|script-title=ko:원어스., 데뷔 1주년 팬미팅 성료…더 기대되는 2020년|website=|via=Naver|date=2020-01-11|access-date=2021-03-12|language=ko}}</ref><ref>{{Cite web|url=https://n.news.naver.com/entertain/article/109/0004148806|script-title=ko:원어스, 데뷔 1주년 팬미팅 '대박 성공'..무대 천재+팬바보 입증|website=Osen|via=Naver|date=2020-01-11|access-date=2021-03-12|language=ko}}</ref>
Pada awal Februari, diumumkan bahwa Oneus akan menggelar konser Jepang mereka ''2020 Oneus Japan 2nd Live <Fly With Us Final>'' di Osaka pada 8-9 Februari dan Chiba pada 15-16 Februari.<ref>{{Cite web|url=http://www.kdfnews.com/news/articleView.html?idxno=41950|title=K팝 핫루키 원어스, 두번째 일본 단독 라이브|date=February 1, 2020|website=한국면세뉴스}}</ref> Konser tersebut dihadiri oleh 2,200 penggemar di Osaka<ref>{{Cite web|url=https://n.news.naver.com/entertain/article/382/0000797160|title=원어스(ONEUS), 日 오사카 단독 콘서트 성료…다음은 도쿄|website=n.news.naver.com}}</ref><ref>{{Cite web|url=https://n.news.naver.com/entertain/article/421/0004453616|title=원어스, 일본 오사카 공연 성황…국악 버전 무대 포함|website=n.news.naver.com}}</ref> dan 3,800 penggemar di Chiba.<ref>{{Cite web|url=https://n.news.naver.com/entertain/article/215/0000848627|title=원어스, 韓美日 단독 콘서트 'FLY WITH US' 성료…'차세대 K팝 보이그룹' 입증|website=n.news.naver.com}}</ref><ref>{{Cite web|url=https://n.news.naver.com/entertain/article/312/0000436086|title=원어스, 韓·美·日 단독 콘서트 '성황'…공연형 보이그룹 발돋움|website=n.news.naver.com}}</ref>
Pada 20 Maret, diumumkan bahwa mereka akan bergabung dalam acara kompetisi realitas Mnet ''[[Road to Kingdom]]''.<ref name="RTK">{{Cite web|url=http://osen.mt.co.kr/article/G1111326771|title=펜타곤·온앤오프·골든차일드·더보이즈·베리베리·원어스·TOO, '로드 투 킹덤' 출연 확정 [공식]|trans-title=Pentagon, ONF, Golden Child, The Boys, Verivery, Oneus, TOO, confirmed 'Road to Kingdom' appearance [Official]|work=OSEN|date=March 20, 2020}}</ref> Pada 12 Juni, mereka merilis "Come Back Home" untuk episode terakhir acara tersebut, dan menduduki peringkat ke-4 secara keseluruhan.
Pada 24 Maret, mereka merilis singel album pertama ''In Its Time'' dengan singel utama "A Song Written Easily".<ref>{{Citation|title=ONEUS(원어스) '쉽게 쓰여진 노래 (A Song Written Easily)' MV|url=https://www.youtube.com/watch?v=Fbj4Dh-QkpA|language=en|access-date=2020-04-16}}</ref>
Pada 14 Agustus, mereka merilis album mini keempat ''Lived'', dengan singel utama "To Be Or Not To Be".<ref>{{Cite web|url=https://n.news.naver.com/entertain/now/article/108/0002883329|title=원어스, 8월 19일 컴백..'로드 투 킹덤' 이후 첫 활동|website=n.news.naver.com}}</ref>
Pada 1 Desember, mereka merilis singel digital pertama "Bbusyeo".<ref>{{Cite web|url=https://entertain.v.daum.net/v/20201127091352539|title=원어스, 12월 1일 신곡 '뿌셔' 발매..첫 온택트 라이브서 무대 최초 공개[공식입장]|website=entertain.v.daum.net}}</ref>
===2021–sekarang: ''Devil'' dan ''Binary Code''===
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