According to Netease's inquiry, the lottery number of the Hidden Treasure Hall represents the special rights and interests of players participating in specific activities or purchases. This lottery number requires a one-time payment at the time of purchase. This is because from the operational point of view, one-time payment can ensure the smooth progress of activities and avoid the complexity and uncertain payment risk brought by installment payment. In addition, one-time payment is also helpful for fund management and event preparation. For limited or popular activities, lottery numbers are often very popular. In order to ensure fairness and smooth activities, it is very common to ask players to pay in one lump sum.