Apart from being part of the BTS, RM also has long developed itself as a popular solo artist and built a name for itself in the industry. One of the best reasons for this is the continuous contributions of his second solo mixtape "mono." 
"Mono." released back in 2018, continues charting at # 1 on several iTunes chart countries and has charted # 1 in a total of 117 iTunes countries so far.
Mono. "is also The Second World Artist to have the Most # 1 on iTunes for an song, and the Highest Asian Charting Act in iTunes history.