Roy Kim is the voice behind "Flower" for the 'Call it Love' OST.

The music video features scenes from the past and present of Shim Woo Joo (played by Lee Sung Kyung) and Han Dong Jun (Kim Young Kwang) as they rekindle their unlikely relationship. "Flower" serves as the theme song for the two star-crossed lovers.

Listen to Roy Kim's "Flower" above! Have you been following 'Call it Love'?