On December 4 KST, Kim Jae Hwan released a teaser scheduler for his upcoming 4th mini album 'The Letter'. According to the scheduler, Kim Jae Hwan will be releasing a mood concept photo, 8 different concept photos and films, 2 sets of voice films, 2 different title concept posters, a lyric teaser, a cover image, two different music video teasers, and more.

'The Letter' marks Kim Jae Hwan's return to the music industry after seven months, following the release of his 3rd mini album 'Change' in April of this year. 

Meanwhile, Kim Jae Hwan's 4th mini album 'The Letter' will be released through various music platforms on December 27 at 6PM KST.