Yama&Hotchicks officially formed the group after SuA, a former competitor on the show Produce 101, joined when they released a stage teaser of their project "Bloom the SEEART" after releasing a dance cover of members SuA and Hyedam, until finally, all the members performed together. Every Saturday from October 29 to November 19, 2016, the group held a series of live streams on AfreecaTv to introduce the members and followed through their debut preparation, presenting two original songs called "Ice Cream" and "Good Life" that would presumably be used for their debut in 2017. During the introductions, member Hyedam was not able to participate, the reason due to her age.
On December 12, 2016, they released the preview single "Bloom The SEEART". The title track "Cupcake" was produced by Ryan S. Jhun, who also produced "Dumb Dumb", "I", "Whatta Man" and "Crush".
Later in 2017, SeeArt tried out for MIXNINE, performing a somewhat altered version of KARA's "Mamma Mia". In 2018, member Hyedam left and the group moved to KRAZY Entertainment, also changing their name to OAHSIS. In July 2019, the group began releasing teasers ahead of their debut in the second half of 2019.
Individual and group teasers were only for six members with Chohyeon missing, likely having already left the group. Despite multiple clips and video teasers released, OAH! SIS ceased activities entirely after July.
On October 11, the members announced via Instagram that OAH! SIS's debut had been cancelled by their company and they had disbanded.
Discography
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