College Student Internet Celebrity Died for Love on a Snowy Night

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The protagonist is from the game, his surname seems to be Song, and he helps his great-great-grandson (likely). Has a Taoist background. The first time was the ghost brother, who had a mahogany sword that he recognized as his owner. The villain is called Shadow(?) Which is a bit evil. As a former human, he works undercover in the game and is called an upstart.