Uh no. Unfortunately this calendar is currently only a concept 🙂
Hei zhuan : an aged, smoked, fermented tea from Hunan.
It’s a variety of Anhua Heicha
Those fresh tea based drinks are way less (not at all actually) sugary then our Icetea and other Nestea. It’s not quite easy to find them in Europe. These drinks are made in Thailand and sold in Japan, USA, and many other countries.