2021 was a year for K-pop nostalgia, as 2PM, 2AM, T-ara and Brave Girls racked up views, awards and appearances and Girls’ Generation members hinted at a comeback

• Older K-pop groups such as 2PM and 2AM had a revival in 2021, despite not having released any music for years. Girls’ Generation members hinted at a new release
• Such groups – they also include T-ara and Brave Girls – belong to K-pop’s second generation, active from around 2007 to 2015