Parallel World: the Underworld Allows Us to Exchange Lives

Rebirth + double penetration + no system + conspiracy + family battle + war + survival One is a poor and impoverished person from the Warring States Period. One is an heir to a wealthy family who returned from studying abroad. A man with a simple nature and a view of everything in the world is good, but he cannot withstand the torrent of history. A man who kills without any knowledge of the sufferings of the world, but is also deeply involved in the whirlpool of family feuds. Because of Black and White's carelessness, the two exchanged identities. War, conspiracy, frame-up, assassination, emotional entanglement... After a series of adventures, the two found their respective places in their new life. Just when the two had accepted the status quo, a routine inspection in the underworld linked their fates together again. When we live, we live together; when we die, we die together...