A case of the flu quickly morphs into a pandemic. As the death toll mounts and the living panic, the government plans extreme measures to contain it.
Tower Sky, a luxurious building complex, has organised a lavish Christmas party for its VIP guests. However, things go awry when a fire breaks out and thousands of lives are endangered.
In the spring of 1999, a group of old friends gather to celebrate their 20 year reunion. Among the group is Yeong-ho, a cold, unhappy man, whose demeanor puts a damper on the festivities. The seriousness of Yeong-ho's depression becomes apparent when he climbs a railroad bridge and looks like he might jump. At this crucial moment, memories of seven crucial episodes from Yeong-ho's past flood his mind.
