Kim Yeon Woo and his current label Dio Music�sued his previous label Mystic Entertainment. According to his previous contract at Mystic, Kim Yeon Woo and the label would split music contents 60:40, and they would split profits from other entertainment activities 70:30.

The problem arose from his 'Masked Singer' appearance. Mystic Entertainment had split profits that came from his songs on 'Masked Singer' 60:40, as they were profit from music sales. However, Dio Music argued they should actually be split 30:70, as they were from his 'Masked Singer' appearance.

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