B1A4 held a special event prior to their first solo concert.
On October 18, B1A4’s Jinyoung and Sandeul tweeted, “B1A4 as dolls!! Did you see us this morning? ^^”, and attached photos of the members in animal costumes. Sandeul later wrote, “The student who grabbed the duck’s tail earlier is mean.. ㅠㅠ..”
B1A4 members had disguised themselves in animal costumes and distributed posters and flyers around a great number of schools across Seoul.
As it was found out that the persons in animal costumes were actual B1A4 members, the fans fell in panic. Others who found out much after they ran into the idol members were very sad they found out too late.