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Su Yunjin (played by Yang Zisan) and Cheng Zheng (played by Han Dongjun) were high school classmates. During their naive and innocent high school days, they had a subtle affection for each other. However, Su Yunjin knew that there was a huge difference in their lifestyles, and it was impossible for them to be together. Therefore, she intentionally avoided him. Nevertheless, Cheng Zheng never gave up, always silently caring for and looking after Su Yunjin. Eventually, Su Yunjin was moved by Cheng Zheng's persistence, and the two became a couple. After graduation, Su Yunjin and Cheng Zheng both entered society to work hard. Su Yunjin is a workaholic, dedicating most of her time to her job, which made Cheng Zheng feel very insecure. He wanted a simple and ordinary life. Ultimately, the growing differences between the two led them to part ways. But even though their bodies were separated, their hearts remained tightly connected.