Trying to make the answer randomly generated after retry in C#

using System;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {   

            int num1 = int.Parse(args[0]);
            int num2 = int.Parse(args[1]);            
            bool GameOver = false;
            int turn = 3;
            Random random = new Random();
            int answer = random.Next(num1, num2);        
            // string input = "";

            Console.WriteLine("Hello, welcome to the guess a number challenge");

            while (!GameOver)
            {
                if (turn != 0)
                {                    
                    turn--;
                    Console.WriteLine($"Please Select number between {num1} to {num2}:");                    
                    int SelectedNumber = int.Parse(Console.ReadLine());
                    if (SelectedNumber < answer && SelectedNumber >= num1)
                    {
                        System.Console.WriteLine("Almost there, just the number is too small\n");
                    } else if (SelectedNumber > answer && SelectedNumber <= num2)
                    {
                        System.Console.WriteLine("Your number is too big\n");
                    } else if(SelectedNumber == answer)
                    {
                        System.Console.WriteLine("CONGRATULATIONS!!!! You guess it right\n");
                        GameOver = true;
                        retry();
                    } else
                    {
                        System.Console.WriteLine("Your number is out of range\n");
                    }
                } else
                {
                    System.Console.WriteLine($"GAME OVER!!!! The answer is {answer}");
                    GameOver = true;
                    retry();
                }

                void retry() {
                    System.Console.WriteLine("Would you like to retry? Y/N");
                    string input = Console.ReadLine();
                    string ConsoleInput = input.ToLower();
                    if(ConsoleInput == "y")
                    {
                        GameOver = false;
                        turn = 3;
                    } else if(ConsoleInput == "n")
                    {
                        GameOver = true;
                    } else
                    {
                        Console.WriteLine("Invalid input");
                        retry();
                    }
                }
            }
        }
    }
}

Hello all, just want to ask a question. I tried to build "guess a number" game in terminal, where player has to guess a number based on the number range given. I tried to make the answer randomly generated, thus the Random class. and the answer will be randomized after retry. The problem is, after each retry, the answer is still the same. I am not sure where did I did wrong. Thanks for the help, and sorry for the noob question.