"Mr. Chu" is a song by South Korean girl group Apink. The song is their 5th Korean single and served as the lead single from their 4th mini-album Pink Blossom. It was released on March 31, 2014 by A Cube Entertainment. The song composed by Duble Sidekick. The song's music video was directed by Digipedi and released on the same day. Apink performed the song for the first time on KBS's Music Bank on April 4. The song peaked at number 2 on Billboard's K-Pop Hot 100. Apink won six music show trophies for "Mr. Chu" and wrapped up promotions for Mr. Chu on May 25. The song was the eighth best selling digital song in 2014, according to Gaon's year-end chart. "Mr.Chu" was used for G9 TV commercial featuring Apink and comedian Lee Guk-Joo. The Japanese version of "Mr. Chu" released as their second Japanese single on February 18, 2015. On January 22, 2015 the short PV for "Mr. Chu" 'on-stage' Japanese version was released.

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. Mr Chu is named after the boss of Plan A Entertainment, APink's parent company. This reflects the hardship of the group during their trainee days, where they had to kiss the eponymous Mr Chu at the start of training everyday. 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. On March 24, a medley clip was released, giving a short preview of all six tracks of the upcoming album.

On March 27, Acube uploaded a twenty six-second teaser trailer for the music video of "Mr. Chu" on Apink's official YouTube Channel. The teaser features Apink members dressed in tennis outfit holding presents on their laps while watching a tennis match played by the "Mr.Chu". The full music video was released together with the 4th mini album "Pink Blossoms" on March 31.

The music video was directed by Digipedi Studio. The shooting lasted 24 hours in a studio located at Gyeonggi-do area. Digipedi used complementary colors with graphic layouts and fixed cuts to make each short story. 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 the popular guy who plays tennis while the girl watching attentively. The girls can be seen squeezing love letters and gifts into his locker that already stuffed with presents. At the end of the music video, they show the calendar of March with all dates being crossed off until a kiss mark on the 31st, pointed out to the day the music video was released.

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