Only LOF open-end funds can be traded in the secondary market. Another 50ETF or something will do. If you want to buy funds in the secondary market, it is recommended to buy closed-end funds. The handling fee of closed-end funds is lower than that of open-end funds. Closed-end funds are traded at a discount, and the risk is relatively low.

The function of the front-end code is that if you use this code to intervene in the fund, you will deduct the handling fee you should pay when you buy the fund, while the back-end fee will only be charged when you redeem it.