It tells the story of Tang Meng Yan, a blue star woman 40 billion light-years away, who has conducted civilized exploration on the earth in accordance with the mission of the alien trade union for 100 years. When she was about to leave the earth, she met Ye Chen Feng, her lover from the previous life, and the two continued their relationship, but she had to return to Blue Star with only 10 days left. Ten years later, Tang Meng Yan returned to Earth from Blue Star and lived a peaceful life in the teahouse with Ye Chen Feng. This time, how far can their love go?