diff --git a/collection/aws/ec2_collector/aws_collect.py b/collection/aws/ec2_collector/aws_collect.py
index 85c7272..27fd116 100644
--- a/collection/aws/ec2_collector/aws_collect.py
+++ b/collection/aws/ec2_collector/aws_collect.py
@@ -51,7 +51,7 @@
 
 current_df = build_join_df(spot_price_df, ondemand_price_df, spotinfo_df, sps_df)
 
-update_latest(current_df) # upload current data to S3
+update_latest(current_df, timestamp) # upload current data to S3
 save_raw(current_df, timestamp)
 
 if 'latest_df.pkl' not in os.listdir(f'{LOCAL_PATH}/'):
diff --git a/collection/aws/ec2_collector/join_data.py b/collection/aws/ec2_collector/join_data.py
index e22c846..ee9c893 100644
--- a/collection/aws/ec2_collector/join_data.py
+++ b/collection/aws/ec2_collector/join_data.py
@@ -21,11 +21,11 @@ def build_join_df(spot_price_df, ondemand_price_df, spotinfo_df, sps_df):
     join_df = pd.merge(join_df, spotinfo_df, how="outer")
 
     join_df['Savings'] = 100.0 - (join_df['SpotPrice'] * 100 / join_df['OndemandPrice'])
-    join_df['Savings'] = join_df['Savings'].fillna(0)
-    join_df['SPS'] = join_df['SPS'].fillna(0)
-    join_df['SpotPrice'] = join_df['SpotPrice'].fillna(0)
-    join_df['OndemandPrice'] = join_df['OndemandPrice'].fillna(0)
-    join_df['IF'] = join_df['IF'].fillna(0)
+    join_df['Savings'] = join_df['Savings'].fillna(-1)
+    join_df['SPS'] = join_df['SPS'].fillna(-1)
+    join_df['SpotPrice'] = join_df['SpotPrice'].fillna(-1)
+    join_df['OndemandPrice'] = join_df['OndemandPrice'].fillna(-1)
+    join_df['IF'] = join_df['IF'].fillna(-1)
 
     join_df['Savings'] = join_df['Savings'].astype('int')
     join_df['SPS'] = join_df['SPS'].astype('int')
diff --git a/collection/aws/ec2_collector/upload_data.py b/collection/aws/ec2_collector/upload_data.py
index 596097f..0348a25 100644
--- a/collection/aws/ec2_collector/upload_data.py
+++ b/collection/aws/ec2_collector/upload_data.py
@@ -71,9 +71,12 @@ def upload_timestream(data, timestamp):
     print(f"end : {counter}")
 
 
-def update_latest(data):
+def update_latest(data, timestamp):
     filename = 'latest_aws.json'
-    result = data.to_json(f"{LOCAL_PATH}/{filename}")
+    data = data.drop(data[(data['AZ'].isna()) | (data['Region'].isna()) | (data['InstanceType'].isna())].index)
+    data['time'] = timestamp.strftime("%Y-%m-%d %H:%M:%S")
+    data['id'] = data.index+1
+    result = data.to_json(f"{LOCAL_PATH}/{filename}", orient="records")
     s3_path = f'latest_data/{filename}'
     session = boto3.Session()
     s3 = session.client('s3')