This article contains spoilers. Given its bright apartments, sunny days, and sometimes fiery characters, you could be forgiven for mistaking the joy for something other than existence—the horror drama that it is. Zombies lurk in every corner, but they appear only in sparingly and well-executed set pieces that punctuate a series that remains delightfully enjoyable two-thirds of the way through. Soon after they move to a public housing unit in Tower 101 in Le Ciel. Flat Complex, Yoon Sai….