TWICE's Chaeyoung posted a video listening and singing along to Somi's debut song "Birthday".

Chaeyoung is one of Somi's closest friends since her trainee days in JYP Entertainment. Their friendship continued when they both participated in the survival show SIXTEEN and even til Chaeyoung debuted in TWICE. 

To show that their friendship is as strong as ever and to express her support, Chaeyoung posted a self-taken video via Instagram stories where she's seen jamming to Somi's song (right after she posted her birthday greeting to TWICE's Tzuyu... such an adorable coincidence!)