1. Going back to Earth, staying behind

It's 2077, and from the Moon Station, solar energy is being harnessed and sent back to Earth in microwave form. Its manager, Xie Lian, is overseeing the operations.
Astronautics program graduate and first Moon mission at 21, then doing mission after mission, he looks friendly but is cool and detached, no one knowing what's on his mind.
When Hua Cheng, a biochemist researching RNR enzymes on space on the Moon Station's electron microscope comes on his first mission, some things start to change...