Customs and Border Protection later stated that management was lying about the reason for being denied entry. The group's management claimed that customs mistook the girls for underage prostitutes due to props and outfits for their special performance at an event on the Saturday of that week, and that they were detained for 15 hours. On December 11, the group flew to LA for a photoshoot for their next album jacket and to perform at a special event, but could not get cleared by customs to enter the US. The music video for their lead track "Closer" was released on October 7. On October 1, teaser images for their comeback album, Closer, was released. On June 21, the group announced that they were currently preparing a new album. They first performed the song on SBS The Show. On April 20, the group released their first mini-album Oh My Girl with "Cupid" as the lead track, and held their debut showcase the same day. On March 29, teaser images of the eight members were released as well as their concept images. OH MY GIRL was publicized as the new sister group of label-mate group B1A4. History 2015: Debut with Oh My Girl, Closer, LA Airport incident 1.7 2021: Dear OHMYGIRL, "Dun Dun Dance (Japanese ver.)".1.6 2020: Eternally, Nonstop, "Etoile / Nonstop (Japanese ver.)".1.5 2019: Japanese debut, The Fifth Season, OH MY GIRL Japan 2nd Album, Fall in Love, Jiho Hiatus, Queendom.1.4 2018: Banana Allergy Monkey, BANHANA Japanese debut, Remember Me.1.3 2017–2018: Coloring Book, JinE's departure, Secret Garden.1.2 2016: Pink Ocean, fandom name, Listen To My Word.1.1 2015: Debut with Oh My Girl, Closer, LA Airport incident.