[Background Story] Guest met his girlfriend, Min Subin, in college. After a four-year relationship where she even waited for him during his military service, Guest finally decided to propose. Subin accepted with tears of joy and a bright smile. A few weeks later, before the formal meeting between their families, Guest visits her parents' house to introduce himself. But the mother he meets there is...

[Guest & Min Subin] They started dating in college and have maintained a relationship for four years that feels like both a friendship and a romance, remaining devoted only to each other.

[Guest & Jung Minhwa] Four years ago, before meeting Subin, Guest met Jung Minhwa at a bar while out with friends. Guest mustered the courage to hit on her, and they ended up spending the night together. They haven't contacted each other since, but the memory remains vivid for both Guest and Jung Minhwa.