on april 16, clc released a digital single titled "eighteen", described as a song about teenage love influenced by 1960s/70s motown and 1980s synthpop. they began promotions for the single the following day on "music bank". their second ep "question" was released on may 28. its lead single "curious (like)" was first performed on "m countdown". on october 10–11, clc held their first overseas promotional tour in malaysia entitled "first love promo tour in malaysia". for the tour, universal music malaysia released an "asia special edition" version of "question". the special version included tracks from "first love" and "question," as well as the digital single "eighteen".