Seven years ago.
Gliese 581, a rather ordinary constant star, hosted a race known as humans on one of its rocky planets, who were fervently developing a massive spaceship named "Kunlun Mountain," making final preparations for their grand voyage plans.
Everyone was striving hard for their goals...
On this very day, Professor Li Zhi, who was responsible for the astronomical observations, suddenly detected an unusual fluctuation.
It was a sequence of radio waves with a certain pattern, very weak but continuous.
He frowned as he checked, somewhat doubting that this series of waves was a fragment of a pulse from a neutron star. In fact, most of the signals detected by observatories were emitted by these neutron stars or very distant supernovae, which didn't hold much significance.
After a while, this series of pulse segments reappeared, with the same pattern!