Ling Xiao, the God of War of the Three Realms, is the Demon-Slaying Lord and disguises himself as a Medicine Fairy to sneak into the Demon Realm; the Demon Lord Nirvana is the Exploring God Realm and transforms into a Succubus lurking around her. The two "weakly join forces", show off each other's acting skills on the edge of life and death, "protect" each other, and even have a secret love. It wasn't until they teamed up to defeat the final BOSS and were about to retire having succeeded, that they were both exposed - So you're also playing me? This is a story that starts with lies, ends with sincerity, and ends with two big guys fighting (by the way) to govern the three realms.
