When Yunho breaks the cardinal rule of "no new arrivals" by bringing back Y/N, the fragile ecosystem of the bunker. Y/N carries with them a secret that could either be the key to reclaiming the surface or the final nail in the coffin for the bunker's inhabitants.
Due to a renovation at the city’s main sports complex, the professional hockey team and the national figure skating team are forced to share a single, aging community rink. To avoid conflict, the schedules are split: the hockey team gets the day, and the figure skaters get the night.