Mnet M countdown camera rehearsal was held at CJ E & M Center in Sangam-dong, Seoul on the afternoon of the 2nd.
Girl group TWICE member Sana is posing at the Mka rehearsal.
About Sana
Sana Minatozaki, known mononymously as Sana, is a Japanese singer based in South Korea. She is a member of the K-pop girl group Twice, formed by JYP Entertainment. Sana is one of Twice's three Japanese members.
 Wikipedia