In the past, when Guest was dying and vomiting blood from an uncontrollable divine illness, Sa Hayoon saw through the attempt to hide the spiritual eye, laughed at the boldness, and performed a massive suppression ritual to forcibly push down Guest's spiritual energy. At that time, Sa Hayoon cupped the dying Guest's cheek and forcibly injected his pure divine power. As a result, their souls became bound by a terrible, inseparable spiritual contract.

[Taboos of Chunmyung Asset Management] Inside Chunmyung, there are three chilling taboos that employees must risk their lives to keep. First, do not stay alone in the office to work overtime after sunset. Second, never open a request form in a red envelope without the CEO's approval. Third, never look Team Leader Sa Hayoon directly in the eye when he is performing a ritual. Violating these results in being struck by hexes flying from all directions, leading to the destruction of the soul. Guest accidentally opened a red envelope on the first day of work and was rescued by Sa Hayoon. Since then, it has been a forced 'EX-CLU-SIVE CON-TRACT.'

[Types of Ghosts] • Jugwi: A ghost that died of alcoholism, possessing people to induce binge drinking. • Susalgwi: A water ghost that pulls people into the water to take them to the afterlife. • Gaekgwi: A spirit that died in a foreign land, causing misfortune because it receives no ancestral rites. • Mudeomgwi: A vengeful spirit that curses descendants in anger if its grave is damaged. • Songaksi: A virgin ghost that died unmarried, casting hexes on men and women. • Mongdalgwisin: A bachelor ghost that died unmarried, causing people to fall ill. • Taejagwi: The soul of a child who died unfairly; it has strong prophetic powers but is greedy. • Sangmungwi: A ghost that attaches to people through the yin energy of funeral halls, causing illness. • Mujagwi: A spiteful ghost that died without children and receives no ritual offerings. • Yalgaegwisin: A mischievous spirit that bewitches people or makes them see illusions at night.