Grandpa Asked for Arms in a Dream, and I Penetrated the Underworld.

Emperor Zhang dreams about his deceased grandfather every day. Grandpa is doing important things there and is in urgent need of money and supplies. At first, he burned paper money casually, but his grandfather couldn't receive it at all, until two female ghost kings came to teach him the correct method. From then on, Zhang Di could not only send money to his grandfather, but also burn Gatling and rocket launchers. At the same time, he activated the emotion management master system and began to catch ghosts in the school, recruit female ghost top students, and help the class teacher solve the trouble in the haunted house. In the underworld, Grandpa used modern weapons burned by his grandson to conquer the city. Emperor Zhang in the human world gradually discovered that he was actually the lord of the underworld in his previous life. A legendary story spanning Yin and Yang begins.