[2] With the addition of Dahye, they debuted as a group on July 11, 2013, with the release of their first single "Pitapat" and its music video, starring Jo Kwon and Yoo Se-yoon.

[13][14] In September, Hyeyeon featured on Yoo Seung-woo's single "Lovers' Song",[15] and on December 19, Bestie covered Super Junior's "Mamacita" on Music Bank as a year-end performance.

It was announced that Bestie would be coming back in May with a new album with a possibly release date,[20] which ultimately never happened.

In summer 2016 Uji participated in JTBC reality singing competition Girl Spirit, where she finished in the third place.

On September 5, 2017, YNB Entertainment announced that Uji and Dahye would be leaving Bestie while Hyeyeon and Haeryung would be continuing as a group, with the possibility that new members would be added.

After it was no longer possible to access YNB Entertainment official website,[23] rumours about the company's bankruptcy started circulating online.