From January 15-18, the members of H1-KEY unveiled a captivating, black and white teaser poster one by one, counting down to the release of their new digital single, "Thinkin' About You". 

In each individual poster, the H1-KEY members grasped the attention of onlookers with their stunning visuals, as well as the complex emotions shown in their expressions. 

Meanwhile, H1-KEY's upcoming single is the first part of the girl group's new music project, 'H1-KEYnote'. "Thinkin' About You" is a sentimental pop style track, completed by the group's rich vocal performance. 

The song is set to drop on January 19 at 6 PM KST.