Where can I check in for the business seat of Qingdao North Railway Station?

The business seat of Qingdao North Railway Station checks in from the aisle of the business seat and gets on the bus. There are two overpasses in Qingdao North Railway Station, which are located on both sides of the ticket hall to facilitate passengers to enter the station from different directions. Among them, the nearest stop overpass is the "quick stop passage", which is specially used for business travelers who need to stop quickly.