Can you add the contact you deleted back?
你可以將被刪除的聯繫人重新添加回來嗎？
Yes, you can re-add LINE contacts to your friends' list. Search for the contact through LINE's search tool and send a friend request. They'll restore your friends list if they agree.
Before sending a friend request, you must unblock the individual on LINE. You might not be able to add them again as friends until they unblock or re-add you if they remove or block you.
可以，你可以將LINE聯繫人重新添加到你的好友列表中。通過LINE的搜索工具搜索該聯繫人，併發送一個好友請求。如果他們同意，就會通過你的好友請求。
在發送好友請求之前，你必須解除對該人在LINE上的封鎖。如果他們刪除或封鎖你，你可能無法再次添加他們為好友，直到他們解除封鎖或重新添加你。