About the Fact That I Joined the Brave Team Despite Being a Top Ten Hero

I am the Ghost Prince, one of the ten heroes of the Demon King's Castle. When I returned to my hometown to visit old friends, I witnessed the brave team abusing my companion Sand Dragon. At that time, I was only focused on avenging the Sand Dragon, but I ignored that I could only exert one-tenth of my strength under the sun. I was defeated by that bastard hero, and when I woke up, my body actually materialized! The Demon King told me that if the brave team were to act alone, the balance of the game would not be known. Under his order, I concealed my identity. When the brave man asked me my name, in desperation, I changed my name to Adventurer Kaige. For the great cause of Demon King City, I joined the brave team to save the princess. Although her power is sealed, a brave man is just as easy to deceive, and among the omnipotent ten heroes, the princess belongs to the Demon King's Castle! *1. In the different worlds, I will play "Say Good Night in the Demon King's Castle", and I will probably play with Shen Yong, Slime and the like. 2. The cp has not yet been determined, and the protagonist was once a human being. Ps I don't know why, I just think the copywriting is very suitable for this meme hhhhhh Purpose: Break all obstacles and create a peaceful and beautiful new world