 1 year and 3 months earlier.The main song in this single, "Labrador Retriever", was revealed to the public on March 29, 2014 during the encore session of their first concert at the National Olympic Stadium.This single will be released in five types; Type A (Normal / Limited Edition), Type K (Normal / Limited Edition), Type B (Normal / Limited Edition), Type 4 (Normal / Limited Edition) and Theater Edition.