Zhongtian - the middle ground between the human world and heaven. When the soul leaves the body, the first place it arrives at is this transit station. There are 7 spaces here, each staying for 7 days. After these 49 days, some people wash away their sins in their lives and go to heaven; some forget their memories of the human world and become celestial beings who protect Zhongtian; and some become wronged souls who are neither up nor down. In order to avenge his dead lover Lianhua (played by Kim Tae-hee), Li Guo (played by Jung Woo-sung) became a ghost exorcist and wanted to eliminate the evil spirits that harm the human world. Chasing the evil spirits to Zhongtian, he accidentally met a celestial being named Suhua who looked very much like a lotus. Suhua is actually a lotus, but she has forgotten her memories of her life. Suhua holds the spirit necklace that controls Zhongtian, and this has become a treasure that all the evil spirits want to fight for. In order to protect the lotus and defend the human world, Li Guo started a battle with the evil spirits, and at this time, Suhua's memory was miraculously restored bit by bit...