After suffering a fall from grace, a photographer returns to her hometown and bumps into her childhood friend — rekindling an unfinished romance.

"Kumusta?" is a Tagalog greeting, which translates to "how are you?" Kumusta centers on a cultural exchange between the Philippines and South Korea through culinary arts. The cast members temporarily operated a Filipino restaurant named "Kumusta Café" located in the Gangnam District of Seoul. During the production, the cast worked daily shifts ranging from 12 to 16 hours over a period of seven days. The menu features traditional Filipino dishes such as inasal, kare-kare, sisig, and roasted pig (known as lechon).

Professor Se-jeong is thrust into a bloody nightmare when a rapidly mutating virus is released during a biotech conference causing authorities to seal the facility. Trapped inside with no escape, Se-jeong along with a small group of survivors must fight to stay alive while the infected undergo horrific transformations.