According to an exclusive report by E Daily, the two artists have been dating for many months now and they became lovers after working together on their music. 

Ko Hyung Sik (also known as Cloud, a former member of duo Cheeze, made his debut as a pianist of band Bye Bye Band Man. As a producer, he participated in Baek Ye Rin's first solo album, as well as her digital single "Bye Bye My Blue'" and Christmas album. He plans to make his official solo debut next month in March. 

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Sounds like we have a new musician couple!