Wen Song transferred from Jiangcheng to the capital and moved in with the wealthy Luo family.
She'd thought rich people were all hard to get along with, but later found that everyone in the Luo family was kind, except for the cheap older brother she only saw a few times a month.
Whenever Luo Qingchuan came home, he was cold to Wen Song and even resented her for staying with the family.
The next year, Luo's parents had to go abroad for a year because of work. They entrusted Wen Song to Luo Qingchuan, telling him to come home every day and take good care of his "little sister."
At first, Luo Qingchuan was very resistant to having a little sister who wasn't related to him by blood. Then he noticed that whenever she saw him, she'd obediently call him "Brother" in her soft, gentle voice. She was always so sweet and well-behaved.
Eventually, he decided that having a sweet little sister around wasn't so bad after all, until he saw another man appear by Wen Song's side.
Luo Qingchuan: "Song Song, you're a junior in high school now. You can't date."
Wen Song: "I know, Brother."
Just before Wen Song returned to Jiangcheng to take the college entrance exam, Luo Qingchuan told her, "I'll be waiting for you to come back to the capital."
Before long, Luo Qingchuan appeared at the gates of Jiangcheng No. 1 High School.
"I think I can't live without you, Song Song."
After the college entrance exam, the man who'd called Wen Song his little sister every other sentence cornered her in a room.
"Song Song, take pity on your brother. I'm getting on in years, and I still don't have a girlfriend."
After they got together, Wen Song discovered that Luo Qingchuan liked calling her his little sister even more.
"Little sister~ Your brother's been away so long. Don't you miss me?"
"Little sister~ Think about it. Give your brother a home."
"Sweet little sister~ Take pity on your brother. You're the only one I'll ever cherish."