Tong Yixin and Zhong Zihao have known each other for 12 years. He once promised her that he would never leave her no matter what, but how could the promise be fulfilled so easily? When one difficulty after another appears in front of Tong Yixin, the person accompanying her is not Zhong Zihao, but university teacher Chen Mo. Facing reality and fairy tales, where will Tong Yixin's heart go?