Mu Sisi let down Ji Huaiqing, the person who loved her most. When she was an orphan with no parents and no one else in the world, Ji Huaiqing had protected her. But she always thought she wasn’t good enough for him, and never accepted his feelings, not even before she died.
After Mu Sisi’s death, she followed Ji Huaiqing everywhere. He went to every place she had ever wanted to visit, and eventually died in front of her grave.
Together, they enter new worlds again and again, slowly clearing up their misunderstandings, until they finally reach a happy ending.