On April 9, they released their fifth EP, "What Is Love?". This EP gave Twice the title of the first female artists to gain a Platinum award in Korea, selling over 250,000 copies of the album. On April 24, Twice released the music video for their third Japan album, "Wake Me Up", which was released on May 16, 2018. The release of the single album broke records of first day sales. Twice broke records in Japan with their three singles having sold almost 300,000 copies in the first week of being released. 