[The Legend of Luo Xiaohei] Like the Passing Years

After entrusting his disciple Tingni to Laojun, the immortal Yifan set off to explore the edge of the universe. Before leaving, he promised he'd be back soon, but more than a thousand years have passed, and Yifan still hasn't returned.

On the third day after Yifan left, Tingni: Master, Laojun has so many fun things here.

On the seventeenth day after Yifan left, Tingni: Why isn't Master back yet? Did he trick me and go sightseeing on his own?

In the third year after Yifan left, Tingni: Laojun, where do you think Master is? Will he come back?

In the 481st year after Yifan left, Tingni: Master, I've made a new friend. His name is Xuanli.

More than 900 years after Yifan failed to return, Tingni: All I remember is waiting for someone to come back.

Original female protagonist, maybe an all-pairing story (depending on how easily it comes along). Yifan and Laojun are background characters.

Theme: Care for the elderly living alone