LUCAS is about Regina’s encounter with a stranger on the train. Based on a real-life story, Regina writes about her magical experience with the boy, but this song is not as happy as it sounds. She outlines her regret of not approaching him by creating scenarios in her head since she knows that she would never meet him again. Regina was hooked instantly to his eyes and aura that reminded her a lot of NCT’s Lucas, and hence she refers to him as LUCAS throughout the whole song. With references to soul connections, this song is shrouded with themes of fantasies, desperation, and a hint of disillusionment, where Regina hopes to see LUCAS again… some time in her far future.