LOONA's Chuu is the voice behind "Spring Flower" for the 'Into the Ring' OST.

The music video follows the playful romance between job seeker Goo Se Ra (played by Nana) and demoted politician Seo Gong Myung (Park Sung Hoon) as well as Goo Se Ra's friendship with her roommates. "Spring Flower" is an R&B style track that expresses the heart of Goo Se Ra towards Seo Gong Myung. 

Listen to Chuu's "Spring Flower" above! Have you been watching 'Into the Ring'?