On March 25, 2026, Fantagio dropped a new post from Kim Doyeon — a heart-fluttering "mind diary" message that instantly drew attention. Flashing a warm smile, Doyeon greeted fans and teased that they will be joining her for the upcoming film 'Eighteen Youth'. Fans showed their support and excitement by using the hashtags #김도연 and #열여덟청춘.