On January 16, Kim Hyung Jun updated his Instagram with a picture and, "It's been a long time since we performed together. 301 cross. Tomorrow with Heo Young Saeng, Kim Kyu Jong."
To confirm, Kim Hyung Jun's agency SH Entertainment said, "Kim Hyung Jun, Kim Kyu Jong, and Heo Young Saeng will perform at the 'Musical & Talk Concert' that will open on January 17 by the Seoul Metropolitan Police Agency's Mobile Police Corps where Heo Young Saeng is on duty. The three of them have consistently contacted one another, so they had discussed this in advance."