Description

Based on your request, the most prominent 30ml brightening serum designed specifically for sensitive skin is the Cetaphil Bright Healthy Radiance Perfecting Serum. 
Below is the description in English for this product:

Cetaphil Bright Healthy Radiance Perfecting Serum (30 ml) 
Product Overview
A potent, lightweight serum designed specifically for sensitive skin to deliver brighter, more radiant skin. It uses next-generation GentleBright Technology to deliver 7x the brightening power, effectively reducing dark spots while remaining gentle on the skin barrier. 
Key Benefits
7x Brightening Power: Visibly reduces dark spots and improves radiance in as fast as 14 days.
Sensitive Skin Friendly: Hypoallergenic, fragrance-free, and non-comedogenic formula that respects the skin barrier.
Even Skin Tone: Targets dark spots caused by sun, aging, breakouts, and hormonal changes.
Protects & Repairs: Defends against daily environmental stressors like blue light and pollution. 
Key Ingredients
GentleBright Technology: An innovative blend of sea daffodil and niacinamide (Vitamin B3).
Antioxidant C: Brightens the complexion and acts as an antioxidant.
Advanced Peptide: Helps in reducing the appearance of dark spots. 
Usage Instructions
When: Use daily in the morning and evening.
How: Apply after cleansing and toning, and before applying moisturizer.
Application: Gently apply 2-3 drops onto the face and neck. 
Features
Volume: 30 ml
Texture: Lightweight, fast-absorbing
Skin Type: Suitable for all skin types, especially sensitive