The Yawning Teacher Breaks Through to Emperor Realm

Transmigrating to a high-martial world, Jiang Du becomes a down-and-out schoolteacher and binds to a salted fish system—the more he slacks off, the stronger he gets. When a bully kicks down his door, he casually says 'stop fooling around,' and the bully is sent flying, smashing through the courtyard wall. When a sword sect tests its formation, he yawns, and the formation shatters inch by inch. When ten thousand beasts besiege the city, he frowns and mutters 'too noisy,' and the beast king drops dead instantly. The world calls him a hidden emperor and kneels to beg him to come out and teach. Jiang Du, holding a fishing rod, looks bewildered: I just want to take a nap and fish—how did I become a saint? — Description from novelcodex.org