The reality drama will tell the story of 7 co-workers at a company on the verge of going bankrupt, as the SF9 members play the roles of various employees from the top of the hierarchy (Youngbin, the department chief) to the bottom of the hierarchy (Hwiyoung, the intern). All the while, the employees also whisper behind the scenes in order to discover which of their co-workers is actually the son of the CEO, a.k.a 'Heir X'! Watch drama online for free.