Rebirth Starts from Monsters

I was reborn as a monster, and the second person I saw turned out to be the demon king from another world. I must join the demon camp this time... Wait, why am I the only one in such a big square? "Haha, it took me three days to figure out you because I couldn't play the system." Seeing the Demon King smile awkwardly but politely, I knew that there was still a long way to go. "Then... Lord Demon King, I understand that you don't know how to use the system. Then can you enter the secret realm with me?" "No, system holders cannot enter the secret realm." "Can you strengthen my upup for me?" "This... You can only upgrade yourself after passing the secret realm" "What about the gold coins? Demon King, you are the system administrator and the gold coins are always unlimited." "The administrator's salary is 3,000 gold coins per month, and you have just used 10 of them." "Then what else can you do, Demon King?" "Fight, I'm very good at fighting, but I can only stay in the main city now" "Master Demon King, can you give me some authority?" "Of course, you can help me manage it." In this way, the burden on Lin Feng's shoulders became heavier again.