On September 5, Sleepy unveiled that he has helped BTS' Rap Monster to debut as a singer.
He said, "I was at underground crew audition and saw Rap Monster. He can do rap so well. So, I asked him for his number and connected him to BigHit Entertainment. He was only a senior in middle school."
Then Sleepy answered, "I've asked him numerous times, but every time I called him he was in the meetings everyday for six months."
He added, "Nam-joon (Rap Monster), please feature in my music."
(Credit = SBS funE)