The short answer

The Solution Series is three 30 ml dropper serums, each built around one concern: REGLOW for visible dark spots and uneven-looking tone, REWIND for skin that looks less firm and has lost some elasticity, and REFINE for oily, congested skin that also wants soothing, skin barrier support and texture care. Choose one to begin. Using all three together is an option, not a requirement.

What the Solution Series is

The three serums share a design. Each one uses a plant water instead of purified water as its base, carries one headline active at an amount printed on the label and product page, and wears a one-word badge that says what it is for. All three are vegan certified, Made in Korea and sold in 30 ml dropper bottles. They follow the brand's mindful approach to skincare: clean and thoughtful formulations, free from unnecessary or harsh components, with at least six months of dedicated development for every product. They sit in their own Solution collection, and two of them also belong to a line: the Succinic Serum to the Green Line and the PDRN Serum to the Purple Line.

REGLOW, REWIND and REFINE compared

REGLOW REWIND REFINE
Product Dark Spot Solution Vita C TRX Serum Firming Bakuchiol PDRN Serum Jeju Yuja Succinic Balancing Serum
For Visible dark spots and uneven-looking tone Firmness and elasticity, specially for mature skin Oily, congested skin that wants balance and soothing; the Jeju Yuja line, specially for sensitive skin
Brand tags #REGLOW #BRIGHTENING #TONE REFINE #REWIND #ELASTICITY #REFINE #SOOTHING #SKIN BARRIER #TEXTURE CARE
Base Sea buckthorn fruit water 72% Aloe vera leaf water 60% Bamboo water 60%
Headline actives Tranexamic acid 3% (30,000 ppm); niacinamide 2% with alpha-bisabolol 0.5%; MELAWAY 1% (10,000 ppm) 2% (20,000 ppm) of a patented vegan PDRN complex; bakuchiol 1% (10,000 ppm) Succinic acid 2% and niacinamide 2%
Order when layering Second Third First

Read the base figure carefully. For REGLOW, 72% is the sea buckthorn fruit water that replaces purified water; it is not 72% vitamin C, as this explainer shows. In the same way, the 20,000 ppm in REWIND describes a PDRN complex, which another article unpacks.

Choosing your first serum

Start with the sentence that sounds most like your own skin, then ignore the other two for now.

Dark spots and uneven tone (REGLOW). If you are looking at visible dark spots, REGLOW leads with tranexamic acid at 3% (30,000 ppm) and is meant to help the look of dark spots and uneven tone appear brighter. It is the one Solution serum that sits outside the Purple and Green lines.

Firmness and elasticity (REWIND). If the thing you notice is skin that looks less firm, REWIND combines a vegan PDRN complex with bakuchiol, a plant-derived ingredient, for skin that looks firmer and smoother. It is the serum of the Purple Line, the extra skincare line for mature skin.

Oil, texture and sensitivity (REFINE). If your skin turns shiny by afternoon or tends to feel clogged, REFINE is the one built for that. It pairs succinic acid with niacinamide in a bamboo-water base, and it is the serum the Green Line routine uses.

Jeju Yuja Succinic Balancing Serum in a green dropper bottle beside a pale green pool of serum
REFINE, the Succinic serum, in its green dropper bottle.

If you are unsure, the serum comparison page lines the three up, and a few questions help you narrow it down.

How to use one serum, or all three

  1. Cleanse, and use a toner if you have one in your routine.
  2. Squeeze the dropper bulb to fill the glass tube. Place 2-3 drops across your forehead, cheeks and chin.
  3. Press the serum in gently with your palms until it settles. Shake REWIND before you use it.
  4. Follow with a moisturizer. In the morning, finish with a sunscreen.

To use all three in one routine, layer 2-3 drops of each in this order: Succinic, then Vita C TRX, then Bakuchiol PDRN. If your skin is very sensitive or thin, use one serum per routine instead, for example Succinic in the morning and Vita C TRX or Bakuchiol PDRN at night. The journal piece REGLOW, REWIND, REFINE: where to begin walks through those choices in more detail.

Quick answers

Can I use more than one Solution serum at a time?

Yes, in the order above and at 2-3 drops each. People with very sensitive or thin skin are better off using one per routine.

Are the serums gentle enough for sensitive skin?

The brand describes its formulas as a balanced blend of ingredients, gentle even on sensitive skin, and the Green Line is made specially for sensitive skin. Skin still differs, so patch test first and use one serum per routine if yours is very sensitive or thin.

Do the serums replace a moisturizer?

No. A serum is a focus step; a moisturizer comes after it.

Are all three vegan?

Yes, all three are vegan certified. Vegan certification is product by product across the range, so check each page.

Where to go next