diff --git a/DysonNetwork.Sphere/Account/RelationshipController.cs b/DysonNetwork.Sphere/Account/RelationshipController.cs
index 17c9827..5b0a2f4 100644
--- a/DysonNetwork.Sphere/Account/RelationshipController.cs
+++ b/DysonNetwork.Sphere/Account/RelationshipController.cs
@@ -230,4 +230,24 @@ public class RelationshipController(AppDatabase db, RelationshipService rels) :
             return BadRequest(err.Message);
         }
     }
+    
+    [HttpDelete("{userId:guid}/block")]
+    [Authorize]
+    public async Task<ActionResult<Relationship>> UnblockUser(Guid userId)
+    {
+        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
+
+        var relatedUser = await db.Accounts.FindAsync(userId);
+        if (relatedUser is null) return NotFound("Account was not found.");
+
+        try
+        {
+            var relationship = await rels.UnblockAccount(currentUser, relatedUser);
+            return relationship;
+        }
+        catch (InvalidOperationException err)
+        {
+            return BadRequest(err.Message);
+        }
+    }
 }
\ No newline at end of file
diff --git a/DysonNetwork.Sphere/Account/RelationshipService.cs b/DysonNetwork.Sphere/Account/RelationshipService.cs
index 1e2b0d9..6dc2905 100644
--- a/DysonNetwork.Sphere/Account/RelationshipService.cs
+++ b/DysonNetwork.Sphere/Account/RelationshipService.cs
@@ -63,6 +63,19 @@ public class RelationshipService(AppDatabase db, ICacheService cache)
             return await UpdateRelationship(sender.Id, target.Id, RelationshipStatus.Blocked);
         return await CreateRelationship(sender, target, RelationshipStatus.Blocked);
     }
+    
+    public async Task<Relationship> UnblockAccount(Account sender, Account target)
+    {
+        var relationship = await GetRelationship(sender.Id, target.Id, RelationshipStatus.Blocked);
+        if (relationship is null) throw new ArgumentException("There is no relationship between you and the user.");
+        db.Remove(relationship);
+        await db.SaveChangesAsync();
+        
+        await cache.RemoveAsync($"{UserFriendsCacheKeyPrefix}{sender.Id}");
+        await cache.RemoveAsync($"{UserFriendsCacheKeyPrefix}{target.Id}");
+        
+        return relationship;
+    }
 
     public async Task<Relationship> SendFriendRequest(Account sender, Account target)
     {