Physicists have discovered a novel topological semimetal, the Weyl semimetal, whose surface features a non-closed Fermi surface while the low energy quasiparticles in the bulk emerge as Weyl fermions. Here they share a brief review of the development and present perspectives on the next step forward. ; Comment: 15 pages, 3 Figures; Invited Commentary [A short review on recent developments in Weyl semimetals, November 2016] at Nature Materials (Cover Story)