==='''2021: ''We Play'' dan ''Play Game: Holiday'''''===
Grup ini merilis EP ketiga mereka ''[[We Play (album mini)|We Play]]'', menampilkan "After School" sebagai singel utama pada 17 Maret.<ref>{{Cite web|last=Yoo|first=Byung-chul|title="위클리, 17일 신곡 'After School' 음원과 뮤직비디오 발표…신인상 6관왕 넘어 대세돌 노린다"|url=https://entertain.naver.com/now/read?oid=215&aid=0000944360|website=Kyungje TV via Naver (in Korean)|access-date=17 Maret 2021}}</ref><ref>{{Cite web|last=Jang|first=Jin-ri|title="[단독]위클리, 라이언전 손잡고 3월 컴백 '대세의 귀환'"|url=http://www.spotvnews.co.kr/?mod=news&act=articleView&idxno=405859|website=SPOTV (in Korean)|access-date=16 Desember 2021}}</ref><ref>{{Cite web|last=Son|first=Jin-ah|title="위클리, 3월 17일 컴백 확정…미니 3집 'We play' 발매(공식)"|url=https://n.news.naver.com/entertain/now/article/410/0000764623|website=MK Sports via Naver (in Korean)|access-date=16 Desember 2021}}</ref>
Grup ini merilis single "7Days Tension", bekerja sama dengan merek kacamata Korea Selatan Davich, pada 28 Mei.<ref>{{Cite web|last=Jung|first=Hye-yeon|title="위클리, 신곡 '텐션업' 오늘(28일) 발매..청량한 여름 분위기"|url=https://entertain.naver.com/read?oid=112&aid=0003438483|website=Herald POP via Naver (in Korean)|access-date=16 Desember 2021}}</ref>
Grup ini merilis EP keempat mereka ''[[Play Game: Holiday]]'' pada tanggal 4 Agustus, menampilkan "Holiday Party" sebagai singel utama.<ref>{{Cite web|last=Yoon|first=Sang-geun|title="위클리, 8월 4일 'Play Game : Holiday' 컴백 확정[공식]"|url=https://entertain.naver.com/read?oid=108&aid=0002972205|website=Star News via Naver (in Korean)|access-date=16 Desember 2021}}</ref>