Fantastie (판타스티) was a girl group under In Entertainment. The group was first revealed in the fall of 2015 with no members or a set debut date confirmed yet. Following Cupid's departure from In, Amin joined alongside Hyunji and L.Cia from Double B, after the group was merged with Fantastie, and Haeun. They made their debut on December 15, 2016 with their self-titled single "Fantastie", promoting the title track "도도걸" and covering Cupid's "I Feel Good" as its b-side. On August 11 and 12, 2017, Fantastie performed at the Hawaii Korean Festival with Haeun missing for unknown reasons, being absent from Fantastie for a while. This concert was their last performance. Fantastie's official Facebook page was deleted during November 2017, unofficially confirming their disbandment.