Aloners (2021)

Jina (Gong Seung-yeon) is the top employee at a call center, but despite talking to customers all day, she has shut out the world beyond her headset; she lives alone, eats alone, sleeps alone, and her cell phone is her constant companion. When one day she's tasked with training a friendly and naïve new hire (Jung Da-eun), her icy armor is threatened. At the same time, she must navigate an incessantly ingratiating new neighbor, and increasingly urgent phone calls from her father, leaving Jina teetering on the edge of an existential crisis, forcing her to confront why she has isolated herself all these years.