Kang Chinà Âi, posthumously honoured as Queen Chà Ânghwa of the Sinchon Kang clan (, was the second daughter of Kang Poyuk who would become the great-grandmother of Wang Kà Ân, founder of the Goryeo dynasty. As a figure from the Later Silla period, she is the first one from among the ancestors of King Taejo to be accurately reported by the remaining records.
Kang Ch'ung was a son of Kang Hogyà Âng, the founder of the Sinchon Kang clan. He had three children named as Ijegà Ân, Posà Âng and Poyuk. Kang Poyuk married with his niece Kang Tà Âkchu, the daughter of his brother Ijegà Ân, and their daughter Kang Chinà Âi was born. Kang Chinà Âi slept with a Chinese nobleman and birthed Chakchegà Ân. The Chinese nobleman father of her son was from the ruling House of Li of the Tang dynasty, China. According to ' and Koryà Âsa chà Âryo, he was Emperor Suzong of Tang. In Pyeonnyeongangmog (), it stated that Emperor XuÃÂnzong of Tang was the father of Chakchegà Ân. While on his way to find his father in China, Chakchegà Ân met Queen Wonchang and married her and decided to return to Korea instead. According to Record of Seongwon (), Queen Wonchang was a daughter of Tu à ¬nchà Âm from Pyongju. Queen Wonchang gave birth to 4 sons; one of them whose name was Wang Ryung. His son eventually became the founder of Goryeo, Taejo of Goryeo.
According to Goryeosa, her elder sister climbed the top of Mount Ogwan () in a dream. In the dream, she urinated and flooded the whole world and she talked about this dream to her younger sister, Chinà Âi. Chinà Âi thought this dream implied good luck and she bought her sister's dream with her silk woven Chima jeogori. After that she would meet the Tang dynasty prince in Silla and give birth to Chakchegà Ân.