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YOS is the first sub-unit from Apink consist of three members: Bomi, Naeun and Hayoung. The group "officially" formed in 2018 as an April Fool's joke. [1] No song was released back then. They made their first variety show appearance on Idol Room together with the rest of the Apink members. After almost two years, the group released a song called "Love is Blind" which is included in their 9th mini album "LOOK".