Hi @이수민 , welcome to the forum
Within the particular project, click on the blue Share button and note the Members. If there is no Project Admin then you should be able to claim that role.
Then, as the Project Admin you can change the project owner, either by editing the project details from the projects action dripdown menu (on the right of the project’s title) or from a Portfolio that contains the project.
If you cannot beome a Project Admin, you will need to create a support ticket, by following the instructions here: How to contact our Support Team