The development of philosophical science spreads to aspects of the operation of law along with the dynamics of human civilization. However, this philosophical concept must be filtered with the essential values, including Indonesia. This is because the fusion of philosophical ideas with elements as stated in the state constitution of a nation must be interpreted and crystallized in various legal products issued by a government. This study aims to describe the Pancasila perspective on the development of legal philosophy in Indonesia and analyze the meaning of 'justice' from a progressive legal perspective. This research is legal research using a conceptual approach and legislation. The legal materials used in this research are primary legal materials and secondary legal materials. These two materials are considered to examine the legal issues raised in this research. The result of this study is that the philosophy of law in Indonesia is based on the precepts of all the principles in Pancasila. Pancasila is actually in line with the flow of legal philosophy, namely Sociological Jurisprudence. This departs from the three dimensions of Pancasila, which is oriented to give birth to harmony from the implementation of rights and obligations in every existing legal subject. Then, the concept of progressive law provides the view that Justice is more oriented as substantive Justice, not procedural Justice. This is because Justice is the essence of the law itself; so that Justice cannot be calculated mathematically, cannot be interpreted purely textually, or can only be said to be 'fair' when there are two people who have the same share as others.

The misuse of circumstances is one of the important factors that can invalidate the agreement's validity. Even though the parties have agreed on the agreement, if there is an orientation to abuse of circumstances, the agreement is null and void. This study aims to see the existence of abuse of circumstances associated with the principles of contract law. This research is legal research that tries to answer legal issues. Legal issues occupy a central position in a legal problem. This research uses a statutory and conceptual approach. Legal materials in this study include primary legal materials, namely: Civil Code/Burgerlijk Wetboek. Secondary legal materials include books, journal articles, study results and non-legal materials, including legal dictionaries. The analysis was carried out by conducting an inventory and analysis of the primary legal materials in the form of the Civil Code/Burgerlijk Wetboek to find prescriptions as legal recommendations. The study results confirm that the nature of the abuse of circumstances is an imbalance in the parties' positions in the agreement. This can be anticipated by applying the six principles of contract law simultaneously and comprehensively.