I am currently using COSRX The Vitamin C23 Serum.

This is The Vitamin C 23 Serum mentioned by Director Pi.

It is moisturizing and has good ingredients.

Since it is a Vitamin C serum, it is best to apply it at night before going to sleep.

I've been applying this consistently and my complexion has brightened up a bit.

If you apply it too close to your eyes, it might sting a little because Vitamin C is acidic.

It's good if you apply it carefully before going to sleep.