Wenjiu as known as Moxibustion Therapy which is a Traditional Chinese Medicine therapy. It consists of burning dried mugwort that used to warm meridians and promote blood circulation, to dispel cold and relieve pain.
What is "mugwort"?
Its scientific name is called Artemesia Vulgaris or ai ye（艾叶）in Chinese. It has been used for thousands of years in folk medicine, especially in Chinese, Japanese, and Korean traditional medicine. It also found use in modern medicine for their anti-herpetic effect.