The whole dropshipping model works on the premises of making a list of online stores and placing products that are available with dropshipping suppliers. When an order comes from a customer, the online store keeps its profit margin and moves it to the supplier at the cost price set by the supplier. The supplier has an inventory in place, and he ships the order to the buyers directly. In this model, the supplier gets more people selling his product, while the online store sells items without maintaining an inventory and earns through profit margins.
However, if you are willing to run a dropshipping model, it is best to find reliable suppliers, as the customer will ultimately have an interaction with you rather than the supplier. If the supplier is not reliable, it will damage the reputation of your online store.