On October 4, Forest Network announced the addition of two new members, Rui and Eungyul, while also stating that Jeonggyu, Hyun, and 2Soul would be going on a temporary hiatus to focus on their health. In the meantime, the group would be promoting as five. Four days later, it was announced that 2Soul had recovered from his health issues and would be returning to the group. On October 18, Forest Network announced that Eungyul would not be taking part in Seven O'Clock activities due to personal reasons. They released their third mini-album White Night on November 12, 2019.