Useful info- Friends will not be notified when you re-add them.
I have mutual friends/acquaintances with the friend I deleted:
If you have a mutual friend or acquaintance with the friend you deleted, ask them to share your friend's LINE account via Contact.
I know the LINE ID/phone number of the friend I deleted:
If you know the LINE ID or phone number of the friend you deleted, try re-adding them by searching for their LINE ID or phone number.
Note: The phone number search feature is only available for LINE accounts created with LINE versions earlier than 13.11.0 if you're using LINE outside of Hong Kong, Japan, Korea, Taiwan, or Thailand.
I still have a group chat that me and the friend I deleted both used:
1. Tap the Chats tab and select the group chat you both used.
2. Tap the group name at the top of the screen.
3. Tap the icon of the friend you want to re-add, then tap Add.
The chat with the friend I deleted appears in my chat list:
1. Tap the Chats tab, and then choose the chat with the other person.
2. Tap Add.
The chat with the friend I deleted doesn't appear in my chat list:
Useful infoOn your main device (typically your smartphone)
1. Tap the Home tab >
> Chats > Hidden chats.2. Tap Edit next to the person you deleted > Unhide chat.
3. Return to the Home screen, tap the Chats tab, then choose the chat with them.
4. Tap Add.
On your sub device (typically your tablet)
iPad
1. Tap Settings > Chats > Hidden chats.2. Tap Edit next to the person you deleted > Unhide chat.
3. Return to the Home screen, tap the Chats tab, then choose the chat with them.
4. Tap Add.
Android
1. Tap the Home tab >
> Chats > Hidden chats.2. Tap Edit next to the person you deleted > Unhide chat.
3. Return to the Home screen, tap the Chats tab, then choose the chat with them.
4. Tap Add.
See also:
Adding friends on LINE
Differences between deleting/hiding/blocking LINE accounts and doing/undoing these actions