In Incheon, Jang-hyuk, a newly appointed engineer, is hospitalized with Hepatitis B, a non-airborne disease. His parents fear catching it, visiting only once briefly, and his friends send texts instead of visiting. Patients keep their distance too. Jang-hyuk finds solace in nurse Da-eun's kind treatment, discovering she is overworked and tired due to her contractual job, contrasting with his secure position.