WhiteMan_Unity2D/Assets/02_Scripts/GlobalObject.cs

using UnityEngine;

public class GlobalObject : MonoBehaviour
{
    private static GlobalObject _instance;
    void Awake()
    {
        if (_instance == null)
        {
            _instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
        }
    }
}