If you are a fan of Indonesian underground hip-hop, especially the raw, poetic, and socially charged genre of Ngapak hip-hop, you have undoubtedly heard of (Ndex Aka). Born Yonanda F.X. Silaen in Cilacap, Central Java, NDX Aka has risen from the local lapak (street stalls) to becoming one of the most streamed independent artists in Indonesia.