The directions are in Korean, and although Lauren is Korean she didn't understand most of it. So we tried to make sense of the pictures.
Here are the instructions in English if you want to try the mask:
Step 1: Press the syringe down to release the serum, and shake.
Step 2: Squeeze the serum into the packet with the sheet mask.
Step 3: Massage the content in the bag to spread the serum on the mask.
Step 4: Slap the face mask on and wait 15-20 minutes.