Ji Hoo is an introverted guy who's not used to expressing his honest feelings. One day, he meets his first love from college as a student who signed up for his one-day photography class. He tries to keep his distance from her, but she keeps reminding him of the past.

Seung-hyeon, a construction team leader with PTSD, is ordered to inspect Dohak Station, where a fatal accident halted work years ago. Inside the eerie, abandoned tunnels, he and Joo-young encounter two mysterious workers and become lost while trying to escape. Meanwhile, a CEO and a shaman perform a ritual to resume construction, but enraged spirits retaliate, plunging everyone into chaos.

A pastry chef apprentice lives unaware she becomes a wild she-devil nightly. Her family hires their neighbor to watch her night version, as he falls for her day self while seeking to break her curse.

A middle-age couple visit a temple in Chuncheon where they spent their first night together 30 years prior. On the way, one of them cannot find their phone and hurries to find it. As the night unravels, they will come across an ex-lover, a friend, and a young couple who resemble them 30 years ago.