Please recommend a cost-effective skin ampoule.

I'm running low on basic cosmetics, and since Olive Young is having a sale, I'm planning to grab an ampoule. As a student, I can't even imagine buying department store brands that cost over 50,000 won.

I'm posting a question in the community because I'd like to get recommendations for effective skin ampoules that cost less than 20,000 to 30,000 won.

I have oily skin, so I can't use products that are too sticky or heavy because they'll smudge my makeup the next day. Are there any recommendations for a magical skin ampoule that absorbs quickly and refreshes skin while still keeping it from feeling tight?

My friends use Gudal and Toriden a lot, but I'm worried because they feel a bit dry to me.

Since I'm splitting my money between the parts, I don't want to fail, so if you could recommend some great value skin ampoules in the comments, I'd really appreciate it! I want to have flawless skin and become a goddess at the start of the semester!