diff --git a/Solar-Fullstack-LLM-101/18_fact_check_with_kg.ipynb b/Solar-Fullstack-LLM-101/18_fact_check_with_kg.ipynb
index df5b3d9..58b5dd3 100644
--- a/Solar-Fullstack-LLM-101/18_fact_check_with_kg.ipynb
+++ b/Solar-Fullstack-LLM-101/18_fact_check_with_kg.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<a target=\"_blank\" href=\"https://colab.research.google.com/github/UpstageAI/cookbook/blob/main/Solar-Fullstack-LLM-101/16_Reasoning.ipynb\">\n",
+    "<a target=\"_blank\" href=\"https://colab.research.google.com/github/UpstageAI/cookbook/blob/main/Solar-Fullstack-LLM-101/18_fact_check_with_kg.ipynb\">\n",
     "<img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/>\n",
     "</a>"
    ]
@@ -48,30 +48,29 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# @title set API key\n",
-    "import os\n",
-    "import getpass\n",
-    "\n",
-    "from pprint import pprint\n",
-    "\n",
-    "import warnings\n",
-    "\n",
-    "warnings.filterwarnings(\"ignore\")\n",
-    "\n",
-    "if \"google.colab\" in str(get_ipython()):\n",
-    "    # Running in Google Colab. Please set the UPSTAGE_API_KEY in the Colab Secrets\n",
-    "    from google.colab import userdata\n",
-    "\n",
-    "    os.environ[\"UPSTAGE_API_KEY\"] = userdata.get(\"UPSTAGE_API_KEY\")\n",
-    "else:\n",
-    "    # Running locally. Please set the UPSTAGE_API_KEY in the .env file\n",
-    "    from dotenv import load_dotenv\n",
-    "\n",
-    "    load_dotenv()\n",
-    "\n",
-    "if \"UPSTAGE_API_KEY\" not in os.environ:\n",
-    "    os.environ[\"UPSTAGE_API_KEY\"] = getpass.getpass(\"Enter your Upstage API key: \")"
-   ]
+   "# @title set API key\n",
+   "from pprint import pprint\n",
+   "import os\n",
+   "\n",
+   "import warnings\n",
+   "\n",
+   "warnings.filterwarnings(\"ignore\")\n",
+   "\n",
+   "if \"google.colab\" in str(get_ipython()):\n",
+   "    # Running in Google Colab. Please set the UPSTAGE_API_KEY in the Colab Secrets\n",
+   "    from google.colab import userdata\n",
+   "\n",
+   "    os.environ[\"UPSTAGE_API_KEY\"] = userdata.get(\"UPSTAGE_API_KEY\")\n",
+   "else:\n",
+   "    # Running locally. Please set the UPSTAGE_API_KEY in the .env file\n",
+   "    from dotenv import load_dotenv\n",
+   "\n",
+   "    load_dotenv()\n",
+   "\n",
+   "assert (\n",
+   "    \"UPSTAGE_API_KEY\" in os.environ\n",
+   "), \"Please set the UPSTAGE_API_KEY environment variable\""
+  ]
   },
   {
    "cell_type": "code",