Django not recognizing app_label meta data

Problem

I have multiple DBs to connect to for different apps on my django server, which only serves datas from the DB. I recently added new DB and ran python3 manage.py inspectdb --database=new_db, then I added app_label for correct DB connection. But somehow django is keep returning programming error with invalid object name error. I double checked, and DB and tables are exactly there. Then I found out that model was trying to connect to its default database, which doesn't have table I am trying to connect to. What should I try to fix this?

Summaries

  1. django model is trying to connect to its default DB, inspite it has explicitly declared target DB on its Meta part.
  2. DB declaration seems to be fine, because inspectdb was done perfectly.
  3. There's no typo on db declaration, too.

<DB declaration on 'settings.py'>

DATABASES = {
  'default' : {
    'ENGINE' : 'mssql',
    'NAME' : 'DEFAULT_DB',
    'USER' : env('DB_USER'),
    'PASSWORD' : env('DB_PASSWORD'),
    'HOST' : env('DB_HOST'),
    'PORT' : env('DB_PORT'), 
  },
  'new_db' : {
    'ENGINE' : 'mssql',
    'NAME' : 'NEW_DB',
    'USER' : env('DB_USER'),
    'PASSWORD' : env('DB_PASSWORD'),
    'HOST' : env('DB_HOST'),
    'PORT' : env('DB_PORT'), 
  }
}

<Meta data of 'models.py'>

  class Meta:
    managed = False
    app_label='new_db'
    db_table='NEW_TB'
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