It’s a song by South Korean girl group TWICE (트와이스).
“Cheer Up” is the lead single from their upcoming second Mini Album titled “Page Two”.

Shortly after their return confirmed for April 25, the first image teaser for ‘Cheer Up’ was launched, which would be their next song to promote (April 5th).

On April 11, another image titled ‘Cheer Up! Was launched Timetable, in which it was disclosed the agenda of upcoming releases for his return.

On April 12, the list of songs that revealed it would be their second mini album ‘Page Two’, where it was revealed that it will have 7 songs and will be available in two versions.
Pink View and Mint View. All 30,000 copies they placed in pre-sale in Synnara, sold out in just 3 hours.

From 17 to 20 April, they began to launch teaser video and images of the individual concept.

On 21 and 22 April, they released teasers for the music video of “Cheer Up”, and on April 23, the Highlight Medley of ‘Page Two’ was launched.

On April 24 the cover of the mini album was revealed, a few hours before their official return.

Finally, on April 25 the mini album Page Two was released along with the music video for it’s title track ‘Cheer Up’.

Just an hour after they launched, their mini album ‘Page Two’ managed to make their first All Kill with their song to promote in all music portals.