get set

class Knight
{
    protected int hp;

    public int GetHp(){
        return hp;
    }
    public void SetHp(int hp){
        this.hp = hp;
    }
}

class Knight{
    public int hp
    {
        get { return hp; }
        set { hp = value; }
    }
}

Knight hero = new Knight();
hero.hp = 100;
Console.WriteLine(hero.hp);

public int Hp { get; set; }