SS501 have been on a long hiatus, five years to be exact. Now three members of SS501 are back as sub-unit Double S 301.
The sub-unit name is an alternative name to the original SS501, now essentially SS301.
Two members Kim Hyun Joong and Park Jungmin are absent from the promotions.
Kim Hyun Joong is serving is the military whilst also making his name as an actor and solo singer.
Park Jungmin is also serving in the military but has appeared in several Korean and Japanese dramas.
The emotionally driven teaser is the first from the group and promises to be epic in dance moves.