On July 27, 2024, Baekhyun revealed one of his unreleased song, a
bossa nova-inspired "Rendez-Vous" in between of his performances of his encore concert tour
Lonsdaleite Tour [dot]. After the concert stage was over on July 28, a video was released where Baekhyun eating a can of pineapple along with a phrase using a famous line from the movie
Chungking Express and at the end of the video, the date '2024. 09' appeared, hinting a comeback in September. On August 12, 2024, INB100 announced that Baekhyun would make a comeback by releasing his fourth EP titled
Hello, World on September 6, 2024, about 3 years and 5 months since the released of
Bambi and his first work after establishing his own company. The next day, pre-order of the EP began at various online and offline music stores and it has four versions: Pineapple, Photobook Hello, Photobook World, and Folder. INB100 released the scheduler of Baekhyun's fourth EP and revealed various teasing contents on August 14. The music video teasers of the lead single "
Pineapple Slice" were released on September 2 and 5, 2024, respectively. ==Release and promotion==