On January 31, D.O. made a surprise appearance in via fellow EXO member Kai's Instagram post, where Kai bid the month of January goodbye. In the post, Kai looked back on his January by recalling the various birthday celebrations he had with his friends and family, and in one video, D.O. was seen singing the "Happy Birthday" song for Kai with a candle-lit birthday cake!
Fans who were delighted to see an update from D.O. trended the hashtag #Kyungsoo's voice in Korea, sparking new life to EXO-Ls who have been missing D.O. Meanwhile, D.O. is currently on break from promotions while carrying out his mandatory military service.