Fans of BTS lit up Twitter on Monday after the leader of the Korean boy band shared a bit of a yet-to-be-released song on the social media site and confirmed that he was working on his second mixtape.

“Will be in RM 2 someday..,” BTS’ RM wrote in a tweet sent out through the act’s official Twitter account, confirming that he is working on a sequel to his 2015 mixtape, RM. The 25-second clip of RM's song revealed an ambient hip-hop track laden with his mellow tone and echoing sound effects.

Born Kim Namjoon and formerly known as Rap Monster, back in 2015, the rapper released what was the first of three mixtapes put out so far by members of BTS. It preceded Suga’s Agust D, as Agust D, and J-Hope’s Hope World, the latter of which peaked at No. 38 on the Billboard 200 earlier this month. Each of the mixtapes has been released for free downloads and, either upon their release or at a later date, through digital music platforms.