保濕, i am using enro laszio Hydra-Therapy Skin Vitality Treatment - this is the only one that make me feel "my hand is slipping off my face", right after i had the mask. but quite expensive, $65? for 4 times
or lacasta collagen gel - quite good result and cheap, $30? for 500ml.
美白 - give up for a long time
im not an expert at this la! but i recommend that you must use a whitening cleanser for sure
cuz a cleanser is something you'd use everyday no matter what - that way the effect is more long lasting and permanent..
but for other skincare products you're less likely to use it everyday ar ma~