Mentions
Put other pages and members into the body with @. A mentioned person is notified.
Mentioning a person
Type @ in the body and keep typing a name or email; the list of this Space's members narrows down. Pick one and the name goes into the body, and a notification goes to that person's Inbox (받은함). Guests can be mentioned too.
Mentioning a page
In the same @ menu, type a page title to pick a page. The page's title goes into the body as a link, and when the original title changes, it changes here too. When Notion material is imported, links between pages become these mentions.
You can also paste the page's address and choose Mention (멘션) in the menu that appears (Pasting an address).
In a database
Assigning a person in a database's Person (사용자) property puts the entry into that person's Assigned tasks (담당 작업) and into Assigned to me (나에게 배정된 항목) on Home, and notifies them. This is separate from a mention in the body.