In the distant future, human civilization has expanded to the edge of the galaxy, yet many unknown corners still await exploration. Senior interstellar ecological surveyor Lin Yuan and his assistant, a humanoid robot with an advanced emotional simulation system named Xiao He, piloting the ecological scientific research ship Ark, received a special mission from the Galactic Archives Bureau: to find a legendary photosynthetic planet capable of autonomously regulating ecological balance. Guided by an ancient star map, they crossed the sea of stardust and arrived in a previously unrecorded stellar region.