What serums and creams are good for freckles and blemishes?

I've developed a lot of dark spots on my cheeks and under my eyes from wearing a mask all the time. I didn't really get any specific recommendations, so I picked from Olive Young's best-selling products. Isoi is the most

I heard the Blemish Spot Serum is famous. I bought the toner, serum, lotion, and cream set, but it wasn't as good as I expected. It felt like my skin was getting oily. Is there a refreshing serum that is good for freckles and blemishes?