The Reborn Scum Top Repents and Devotes Himself to His Shadow Guard

The main story is complete

Two male leads + dark guard as the bottom + happy ending + top is reborn + a little angsty, but absolutely no third party + both were pure in their past and present lives

Qi Junze (top / manor lord) & Cangwu (bottom / dark guard)

The simple version:

When Cangwu was by his side in their past life:

Qi Junze: "Just a lowly dark guard. I'll have a little fun with him."

After Cangwu left:

Qi Junze: "Cangwu, I miss you so much."

After being reborn:

Qi Junze: "Cangwu, I love you."

Cangwu: "What?!"

The serious version:

Qi Junze enjoyed a life of wealth and privilege, with power firmly in his grasp. He thought his life would go smoothly, but in the year he came of age, he lost the one he loved, and by his own hand. He spent the rest of his life in regret. Then, by a stroke of luck, he returned to ten years earlier. Now he has to win back his beloved and solve the mysteries surrounding himself.

Cangwu had been at his master's side since childhood. Even when he was battered and bruised, he had never considered leaving. But the snow that winter was too cold. It chilled his heart and took his life.