Gentle older sister × tsundere young wolfdog
(Age gap, younger top, 34 × 24)
Blurb 1: That day, Zeng An said to Jiang Yubai with complete seriousness, "I'm going to write you a love letter." Jiang Yubai nodded, hiding a smile. Later, Zeng An proposed to Jiang Yubai. The keepsake that sealed their love was a wooden box containing 1,183 love letters, written over three years and three months, from the day Zeng An made up her mind to this very day.
Blurb 2: "I'll edit the love letters I wrote to you and our story into a book of our love, then let it drift down the Yangtze River," Zeng An said.
"Why?"
"That way, the first volume will tell of the Yangtze and the tender warmth of the setting sun, while the second will be about us." 1
And so, together in heaven and on earth, for a thousand years and ten thousand more.
(Note: 1 Adapted from Jian Zhen's Questions to the Water.)
Theme: Loving you, caring for you, and staying by your side
The first chapter feels a bit like making Jiang Yubai's character similar to the heroine of other books. I might as well change it to another one. It doesn't matter if you read it or not, it won't affect subsequent reading. Note: Sister Jiang has an ex. After all, she is 10 years old.