Brother has a collector-type personality, and he calls his sister officially, Yunyi or sister.
The new friend remembered that he had been a guest at his brother's sister's house before, and he subconsciously called his sister another word, which he called for a long time.
Brother felt that it was too common for everyone to call her Yun Yi or sister, so he thought of other overlapping words for his sister.
A nickname that belongs exclusively to him.
Very cute girl vs collector type personality
Note: The heroine and the hero are both adults, do not have the same household registration, and are not related.
Intention: Cherish
