Both toner and essence should make an early appearance during your skincare routine. And whether you do a full-blown ten to 11 step system or keep it super simple, you shouldn't skimp out on a either. A good way to look at it is your toner aids your cleanser, while an essence makes it possible for the rest of your products to do their job, so they shouldn't be an afterthought (via Allure).  

Post-cleansing, your toner should be next, but this is up for interpretation depending on your skin type. "Although the Korean way is to apply an essence after your toner (that 10-step system can be a bit much to some), it's OK to replace your regular toner with an essence if you're looking for more hydration in your routine," says Allure. Both can be used day and night, and after toning and applying essence, you can follow up with the rest of your serums and moisturizer.