What is the constellation of Qin Hao?

You mean Qin Hao is Yi Nengjing's husband? If so, Qin Hao was born in May 19, Taurus.

Taurus, born from April 2/kloc-0 to May 20 in the solar calendar, is the second house of the zodiac, located east of Aries and west of Gemini.

The Story of Seven Sisters in Taurus (Pleiades)

Seven Sisters is actually the seven daughters of Atlas and Leon, namely Alcyone, Strope, Calano, Electra, Maya, Merope and tigert.