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Your Scalp is Skin. Your Hair is Keratin.

They're not the same -- and they shouldn't be treated the same way.

Pop-Up at Lane Crawford IFC

Hero Product SUNDAY Shampoo

LET YOUR SCALP BREATHE

Your Scalp is Skin. Your Hair is Keratin.

They're not the same -- and they shouldn't be treated the same way.

Pop-Up at Lane Crawford IFC

Hero Product SUNDAY Shampoo

LET YOUR SCALP BREATHE

Products

https://www.youtube.com/watch?v=XhzT7S23Ai4

The Origins

Why Sunday

After decades of styling icons, celebrity hairstylist Pius Yiu saw a pattern—scalp issues mistaken as hair problems. The cause? Treating scalp and hair the same.

That’s why we created SUNDAY: a 360 haircare system.

Our mission is simple: to help people achieve their healthiest scalp and most refined hair effortlessly, from home.

The Present

A 360 hair & scalp care system

Every product is crafted with a blend of scientific precision and clean innovation. Our formulas are sulfate-free, silicone-free, and cruelty-free, made with biocompatible, biodegradable ingredients that respect both your scalp’s biology and the planet.

From the lab to the final product, every step is driven by a commitment to performance and conscious care.

Founder Pius Yiu

A-List celebrity hair stylist

With over 30 years of experience, Pius Yiu has established himself as a true icon for all things hair.

Graduating from the renowned Sassoon Academy in London, he returned to Asia and quickly made his mark on the vibrant Hong Kong entertainment scene.

In 1993, he founded the renowned Orient4 hair salon in the trendy Lan Kwai Fong district. He was director for the prestigious HKTDC Hong Kong Fashion Week for more than 10 years, and also assumed the prestigious role of creative director for Vidal Sassoon, directing both their hair TVCs and shows.

Pius has worked with the biggest names in entertainment, including Louis Koo Tin-Lok, Zhou Xun, Eddie Peng Yu-Yan, Tang Wei, Gigi Leung Wing-Kei, Raymond Lam Fung, Stefanie Sun YanZi, Rene Liu Ruo-Ying, Du Juan, Kelly Lam Hsi-Lei, to name just a few.

Dorothy Hui

Fashion Stylist, Fashion store Buyer & Trichology Practitioner

Dorothy Hui is a Fashion stylist and co-founder of a former boutique concept store ‘Liger’ in Hong Kong.
Styling Director for ‘STREET DANCE OF CHINA Season 3 & 4’
The curator of exhibition merch and the Gift Shop for ‘BEYOND THE STREETS SHANGHAI’

Now transitioning into the hair care industry, she brings a wealth of knowledge and experience as a ‘Certified Trichology Practitioner’, focusing on the health and well-being of hair and scalp.
With a keen eye for style and a passion for hair care, Dorothy is dedicated to elevating beauty standards with innovative products.