Hearts2Hearts, an 8-member girl group under SM Entertainment, is making a comeback with their second mini album 'Lemon Tang' on June 22. The album features 'Lemon Sun' as its main theme and includes diverse online and offline promotions to build anticipation. Online promotions include schedule posters, member teaser images, and a giant yellow 'Lemon Tang blimp' displayed over Seoul's daytime sky. The group collaborated with Pinterest to launch an official board featuring exclusive behind-the-scenes content and concept images with witty internet memes. Offline promotions include operating a unique foot spa with floating lemons called 'Lemon Tang' in Ilsan on June 20-21, and hosting their first popup store at The Hyundai Seoul B1 from June 23 to July 1 with an area of approximately 3,300 square meters featuring various installations, photo zones, games, and merchandise.