When Xu Xundu was ten years old, he was adopted by the Xu family and became Xu Xia'an's nominal brother.
The Xu family treated him well, but he always felt that his sister, who was two years older than him, looked like she was covered in mist when she smiled. She would give him a piece of candy when he was ignored by his parents, and would block the punishment for him when he was rebellious and got into trouble, but she would never say a sincere word to him.
Later, a younger brother was added to the Xu family, and most of her love was taken away from him. He became more and more rebellious and just wanted to attract her attention. He vaguely glimpsed the secret she had hidden deep in her heart - her biological brother who died young had become a shackles to her life, and her parents' resentment pierced her like a needle.
He didn't dare to ask, so he could only hold on to a shady heartbeat as his "brother" and watch her wither little by little.
Until she was diagnosed with acute leukemia, she held on for a breath, hoping to wait until he got the admission notice to prove that he could finally escape from this home.
But she didn't wait.
She died in that winter without summer, leaving him alone in her memories.
Only then did Xu Xundu realize that "summer will not cross me" means that even though he spent his whole life, he could not get through the seventeen years of spring, summer, autumn and winter in his heart.
"You should fly as far as possible, be free forever, and never look back."
Purpose: To complete self-salvation and growth amidst the taboo watch and the regrets of life and death