This study presents a systematic literature review (SLR) aimed at synthesizing and assessing the existing state of knowledge within the chosen research domain. Following a systematic approach aligned with the PRISMA guidelines, 67 peer-reviewed journals published between 2015 and 2025 were selected from the Scopus and Web of Science databases. This review presents the results in two different sections: descriptive bibliometric metadata and thematic analysis, and it investigates the principal research themes, theoretical underpinnings, methodological patterns, and existing research gap. There is dynamic interconnection of volatility spillovers between the green and conventional assets and the time-frequency dynamics analysis highlights that the impacts can be very over the different time periods and market scenario. This study offers the directions for the future research and conclusions for policymakers, executives, regulatory bodies, and academicians.