I Only Wanted to Slack Off, but the Zhu Family Overheard My Thoughts

By a stroke of luck, Zhou Jie transmigrates into the body of an old man in the Hongwu era. To his surprise, the System tells him that all he has to do is slack off to earn rewards. If Zhu Yuanzhang kills him, or if he simply waits for this body to die of old age, he'll return to modern times as a wealthy man.

But slacking off doesn't go as planned.

What? The Northern Yuan is invading? Don't ask me, I'm slacking off!

What? The court is out of money and grain? Don't ask me, I'm slacking off!

What? The court wants to develop new firearms? Don't ask me, I'm slacking off!

What? The court wants to conquer the nations of the world? Don't ask me, I'm... Holy crap! Old Zhu, are you the one who transmigrated here?!