Treat your skin without hurting your wallet. Korean serums are known for their powerful yet gentle formulas, and thankfully, you don’t need to spend a fortune to get results. These 5 Amazon-available Korean serums and ampoules deliver real improvements to brightness, texture, and hydration—for less than $20 each. 🌿 1. iUNIK Propolis Vitamin Synergy Serum  🔗 Buy on Amazon Packed with propolis and sea buckthorn to calm and brighten Great for dull or sensitive skin that needs glow without irritation Small size, big glow—and it layers beautifully 🌿 2. Some By Mi Snail Truecica Miracle…