<p>Based on the finding of a wide supercooled liquid region before crystallization for multicomponent glassy alloys in 1988, bulk metallic glasses (BMGs) were synthesized by casting process for their new alloys in 1989. Subsequently, it was found in 1990 that Zr-based arc-melted alloy ingots can kee a glassy phase even in the slow cooling state on the copper hearth. Since then, much efforts have been devoted to the finding of new alloy compositions, clarifications of fundamental and unique properties and applications in conjunction with production process for BMGs. Nowadays, Fe- and Zr-based BMGs have gained huge application state as structural, magnetic and other functional materials and the commercial products in the case of Zr-based BMGs reach about hundred million pieces in a year. As new metastable materials which were derived from multicomponent BMGs, high-entropy (HE) and pseudo-high entropy (PHE) alloys have attracted academic and engineering interests. When we look at the HE and PHE alloys, their alloys have been developed in the order of equiatomic BMGs in 2002, quiatomic fcc crystalline ribbons in 2004, nearly equiatomic HE bcc thin films in 2004, and then PHE BMGs in 2014. At present, these HE and PHE alloys have been major subjects in materials science and engineering</p>