Kim Sae-ron, who recently appeared on the Netflix series 'Hunting dogs', appears on Yi-I! Brothers' new song Music Video. On October 10, Yi-I! Brothers (EI Brothers) said, "On the 18th, a new song Bittersweet, a collaboration between producer EI Brothers (Insu RX, E-rui) and pop singer Christine Corless, will be released. Kim Sae-ron, who plays HIGHTEEN, will appear in Music Video." Producer EI Brothers (Insu RX, E-rui) has produced songs such as Kim Joo-an's "Wedding Song", Hye-ah's "Spring with You", and Me.Me. He has produced 'Purple Bar' and Zandi 'Waiting For You'. 'Bittersweet' is a song with a message of hope that if you live with your own feelings and life from a subjective point of view without being overwhelmed by negative emotions and situations, you will face true happiness and the life you want. In particular, 'Bittersweet' Music Video features Kim Sae-ron, who plays HIGHTEEN. Kim Sae-ron, who appeared in many works such as 'Neighbors', 'Manhole', 'Witch Watch', 'Love Playlist Season 4' from childhood actor to adult, recently showed up through Netflix series 'Hunting dogs' is.