The story begins a long time ago, a pair of little dolls, from the time they were faltering to the beginning of their love, stuck together all the time. The two of them said that besides "childhood sweethearts", there are also "revolutionary brothers" in this world. To prove that they were serious, the boy went around from the backyard to the door of the girl's house again, knocked on the door, and said the word "brother" seriously to the confused heroine who opened the door. The girl's big dark eyes rolled around for a long time, and then she repeated in a sweet voice: "Brother." But... Her face was indifferent when he asked her to send a love letter, and when he found out that someone was pursuing her, his face was full of anxiety... Are you really brothers? !
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