Spiritual Qi Revival: After Three Years of Slacking Off, I Slay a God with One Sword

"Broken Engagement Trope + A Lifetime of Regret"

From the start, my genius fiancée publicly breaks off our engagement, calls me useless, and ruins my future?

Little does she know, I can't wait for her to get lost!

My Slacker System makes me stronger just for taking it easy!

Three years later, gods and demons descend. She fights desperately while I'm bored out of my mind.

Only when she kneels before me and begs me to step in does she realize that the useless man she once knew has long since reached the heavens with a single sword strike!