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They were childhood sweethearts who grew up together and experienced the baptism of time. She had already had a crush on him, and so did he... But a small misunderstanding made each other think that they had someone they liked. She and he missed each other again and again. They had regrets but more unwillingness to do so. So in order to find out whether the other party had her in his heart, they started a big bet. She bet that he had her in his heart, but he would block her for the rest of his life. A huge gamble on love unfolds like this...