Yeoboseyo (2013)

Mongryong is afraid of communicating with the world. As a hobby he collects phone numbers scribbled on walls. One day out of curiosity, Mongryong dials one of the numbers and meets Simchung. As they share their pain and sorrow, the relationship grows more and more intimate. One day however, Mongryong is hurt by one of Simchung's frivolous lies. He turns his back on her when Simchung needed him the most.