If it is determined that the premise of the law is unconstitutional in the process of a general trial, if the basic right is violated due to the use of public power, the request for an unconstitutional law trial against the law, the state When there is a dispute between institutions, between local governments, or between state agencies and local governments over the existence or scope of authority, a request for a dispute over the competence dispute is made, or when such a constitutional lawsuit is filed, the respondent or interested persons are represented. In addition, we provide professional legal advice on what kind of issues are constitutional.