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During an unexpected gastric attack, An Yu met Ning Shu who fell from the sky to help her, but she had already fainted from the pain and had no idea who the other person was. Unexpectedly, a few days later, in the elective course, Ning Shu would suddenly become her temporary substitute teacher. Under Ning Shu's strong yet gentle attack on her heart, An Yu finally fell into an incredible love. But at a certain moment, he suddenly learned of the death of his parents. In an instant, An Yu fell from the clouds into hell, and even the nightmare sleeping in her heart was approaching step by step...