The Symbiotic Tree

My sister and I are bound together, sharing one life.

When they first met as children, Chen Siyan held an umbrella over Ji Wu and said, "Come home with me."

When they met again years later, Chen Siyan was drunk. Seeing Ji Wu, he asked, "Can I come home with you?"

Chen Siyan said, "The Wu in your name doesn't mean desolate. It's the Wu from 'Where the level plain ends, spring mountains rise.'"

Stubborn, refuses to listen, and fiercely proud x stubborn, impossible to reason with, and possessive (?)

"Sister and younger brother," foster care, no blood relation, and no adoptive kinship.

Theme: There is always someone in the world who loves you.