After Leaving His Mistress, He Became the Familiar They All Fought Over

After transmigrating into another world as the familiar of a vampire noble lady, Lin Shu fell in love with her at first sight.
For three years, he fought for her, risked his life for her, and gave everything he had—only to be met with her indifference and disdain.
Heartbroken, Lin Shu decides to return to his original world.
He dissolves the contract, defects to his mistress’s rival, and begins searching for a way back home.
And then…