The high level of concern for the environment made Cassandra Sari Damayanti and Rendy Aditya start and create Rawhaus.id, an organization that focuses on building micro houses with minimal construction waste. Rawhaus strives to build micro houses with prefab materials that are energy efficient (from the production process to their use), durable, and earthquake resistant, so as to minimize construction waste and carbon footprint. Then, this creative and high social value business idea finally brought Cassandra Sari Damayanti to be the Best of the Best at the 2020 Mandiri Young Entrepreneur event.