After Saving the Gloomy Male Lead, He Regretted It

I was bound to the System and sent into a tragic novel to save a gloomy young man.

Before I left that world, he confessed his love to me, his eyes red as he begged me not to go.

Later, we got married and became the loving couple everyone in our social circle envied.

That is, until the night his first love returned from abroad, when I found a glaring lipstick mark on his shirt collar.

When I confronted him, his voice was icy:

“So what if I did? You’re the one who stubbornly refuses to leave.”