At the age of sixteen, Yan Yan had to change schools again, and on the day of her sophomore year class separation, she encountered a face that would alter the course of her life. “Pretty girl, can I borrow your cell phone?” The boy's tone was lazy and cynical. Demonic. This was Yan Yan's first impression of Chi Sheng, unlucky, this guy was recently rumored to be gossiping with her. If she had known what was going to happen in the future, she swore that she wouldn't mess with him even in death. Somebody said Yan Yan from class 532 was arrogant and reckless, a rose with thorns. Chi Sheng has always been on this kind of Missy respect, but in the instant she stepped into the classroom, stunned. He deliberately approached,but in her false strength, a glimpse of vulnerability, let a person heartache. “We have been fighting openly and secretly for so long, in the end, how should it end?” Chi Sheng was silent for a moment, extinguished his cigarette, walked to her and squatted down. “ let me think about it, okay?” Soon, Yan Yan got what she wanted and became Chi Sheng's girlfriend, but he chose to let go on the eve of the college entrance exam and ran to the ex-girlfriend again. The second winter in Boston, Yan Yan received a wooden roller coaster model, only a short sentence on the card: “If you come back, there is no one else around, can you, consider marrying me, to give me a chance to love you ?"