Desktop
Cookie and cache settings in Naver Whale
Naver Whale is a Chromium browser, so the dialog looks a lot like Chrome. The sidebar is a separate setting from cookie deletion.
Open the controls
Open the dialog
Open the menu at the top right, go to Settings, then Privacy, and open Delete browsing data. The shortcut is often Ctrl+Shift+Delete. On a Mac, try Command+Shift+Delete.
Choose the range and the rows
Pick a time range. Turn on Cookies and other site data, Cached images and files, or both. Leave the other rows off.
Click Delete data
Reload any tab that was already open.
Clear one site only
To clear one site, open it and use the lock icon in the address bar. For a searchable list, look in Whale settings for all site data or cookies. If the label moved in your version, use the settings search box and type "cookies" or "browsing data".
Afterward
Clearing the cache on this computer does not empty the cache in a phone browser. Use the phone page for that device.