유희열의 스케치북
The group took a break during 2017 as Lee focused on his solo activities. In late August 2018 they announced plans for a reunion and returned with the single "Let's Meet Up Now" (만나자), which was released on September 6. Instead of promoting on music shows, they only appeared on "You Hee-yeol's Sketchbook" and performed live in four different open-air venues around Seoul from noon until 10pm on September 7.