NCT's Jungwoo is the voice behind "Smile Good Bye" for the 'Fu Bao and Grandfather' OST.

The music video features Jungwoo in the studio recording the emotional track as well as adorable footage of South Korea's first ever naturally-bred panda Fu Bao. Fu Bao's home has been 'Everland Resort's Panda World' in Yongin City, but she'll be returning to China following the end of the China's "panda diplomacy" program. "Smile Good Bye" is about the touching farewell between Fu Bao and her "grandfather," who looked after her.

Listen to Jungwoo's "Smile Good Bye" above, and let us know what you think in the comments below.