Why is I.O.I’s Chungha wearing a school uniform in Instagram photo with Paul Kim?

K-pop singer Chungha, former member of the Korean group I.O.I, posted a photo of her with singer Paul Kim, but why are both dressed in school uniforms?
K-pop singer Chungha and solo artist Paul Kim collaborated on the song Loveship, which will be released on January 21.
Chungha and Paul Kim both uploaded to Instagram the same black-and-white photo of the pair in a school uniform on January 8.
Kakao M, the music production company, officially revealed on January 13 the two artists will release a duet song, for which Paul Kim has both composed and written the lyrics.
Chungha, best known as a member of the girl group I.O.I from Mnet's survival show Produce 101, debuted with the EP “Hands on Me” on June 7, 2017. One of her songs, Gotta Go, which was released on January 2, 2019, set a milestone of being streamed more than 100 million times as of November 2019.
Paul Kim debuted in 2014 as a ballad singer and gained popularity through his song Every Day, Every Moment, a song from the soundtrack of the 2018 SBS drama Shall We Kiss First?
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This article was originally written by Cho Hae-min for The Korea Times.