The provided reviews primarily focus on the gentle cleansing effectiveness, suitability for sensitive skin, and the product's ability to manage oil and remove impurities. While some users mentioned that their skin felt smooth, refreshed, or more radiant after using the cleanser, there is no direct mention of the product brightening skin tone specifically.

Given the current data, it is difficult to conclusively determine if the MUNG BEAN pH-BALANCED CLEANSING FOAM brightens skin tone. It is possible that the improved appearance of the skin after cleansing could contribute to a perceived brightening effect, but this is not explicitly stated in the reviews.