After his parents divorced, Lu Yang lived at his mother's best friend's house and lived with her daughter, Su Gui. Su Gui, bright and gentle, like the warm winter sun, easily illuminated Lu Yang's life, but also his heart. Lu Yang looked at her, like a sister, like a friend... Later, Lu Yang didn't want to be her sister, she wanted to be with her. But after discovering that her feelings for Su Gui had deteriorated, Lu Yang did not want to break the harmony of the moment, and even more afraid of losing her "sister" identity, she could only tolerate dependence and move away from Su Gui. However, after reuniting with Su Gui because of her work, the feelings she had been suppressing grew wildly, like branches of roses, wrapping herself and Su Gui tightly. Is it a long-planned plan or is it fate?