On March 20, Apink released member teaser photos for their fourth mini album Pink Blossom.

The photos came with the news that the title was called "Mr. Chu", an upbeat dance track composed by Duble Sidekick, David Kim and Seion.

[1] On the following day they released a video teaser featuring Apink members participating in a photo shoot for the new album cover using the instrumental version of "Mr. Chu" as the background music, giving the first preview for the song.

[2] On March 24, a medley clip was released, giving a short preview of all six tracks of the upcoming album.

[6] On January 22, 2015, the short PV for "Mr. Chu" 'on-stage' Japanese version was released through Universal Music YouTube channel ahead of their comeback.

The video features Apink members dance to the song chorus, use their signature moves of blowing kisses at the tennis court.

On March 27, A Cube uploaded a twenty six-second teaser trailer for the music video of "Mr. Chu" on Apink's official YouTube Channel.

The music video starts with a single close up of all of the girls and a mysterious man picking up a tennis ball.

Throughout the music video, it seems like Mr. Chu is pointed out to be the popular guy who plays tennis while the girl watching attentively.

Chu' has Apink putting their hands near their face, close up shots are necessary to show the entirety of the choreography well.

A Cube Entertainment released a statement, "Due to the magnitude of the passenger ship sinking, Apink felt too much pain and did not think they could sing for their fans with a light heart, which is how this decision came to be made.

[20] For the single's promotion in Japan, the group launched album release events in Tokyo, Fukuoka, Osaka and Nagoya.

The release events, which took place in the forms of fan meetings successfully sold out all seats and gathered around 9,300 people.

Countdown after the show returned to broadcast after a three-week-long hiatus on May 8, making a total of six trophies for "Mr.

[29] In Japan, the single debuted at number three on Oricon’s daily album chart and climbing up to second place on the next day ranked behind "SMAP" the nation Japanese Boygroup.

They broke their own record since their Japanese Single Debut, "No No No" only managed to peak at number 3 at the Oricon weekly chart last November.