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The Male Protagonist Travels Through Time in the Han Dynasty, Lu Fei Is the Son of Liu Bang and the Younger Brother of Liu Ying.

I remember the first chapter where the male protagonist hugged Lu Pheasant and cried when he was a child, rubbing his tears and snot on Lu Pheasant's body. Lu Pheasant tricked him into going to Liu Bang and got him beaten. Later he rebelled against Liu Ying (Liu Ying was willing). Became emperor. Lu Pheasant actually loves this child very much.