The 'Voice Korea' winner lent her beautiful voice to Taecyeon and So Yi Hyun's drama to draw out their love as it grows from their first kiss onto their 2nd kiss. THe song itself is a pop ballad song that showcases Yoo Sung Eun's voice to its fullest. 

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The song talks about a love that keeps growing even though they want to stop it, and even talks about parting. Check out the song and the accompanying MV above!