Bolbbalgan4 and Baekhyun reportedly will work together.
Bolbbalgan4 unveiled its "Puberty Book II" promotion time table on its official SNS on April 29.
According to the report, Bolbbalgan4 will release the album on the 13th after release it's pre-released single "Butterfly and Cat" at 6 p.m. on May 7th. EXO's Baekhyun will feature the single "Butterfly and Cat."
Attention is focusing on the collaboration between Bolbbalgan4 and Baekhyun, with a large number of music and big idols making a comeback in May.
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