The ticket prices shown on the homepage of major websites do not include fuel and machine building, and these two items will be charged separately 170 yuan. This is a fee charged by all airlines, not a single website, so don't be too surprised.
Tickets bought online are all special fares, which are generally non-refundable and non-exchangeable. Even if it is changed, it can only be changed to a full-price ticket. Refund will result in a high handling fee, or even only the construction fee and fuel fee will be refunded. So be sure to confirm the itinerary before buying a ticket and carefully check the flight refund rules.
Refund funds will arrive in 3~7 working days, which is also the necessary process time for enterprises to refund individuals. So please prepare sufficient liquidity.