To realize public interest, the administration is granted with superior powers, namely public force. In return, in a state governed by the rule of law, a mechanism is needed to protect the rights of persons before "public force" and to secure the lawfulness of the "powerful" administration. Administrative law may be seen as a balance between public interest which is in favor of people as a community and public force which restricts the rights of persons. This book covers the general principles that administration should abide by, while serving for public interest by using public force.