Don't Breathe

Su-Yeong, a man who lost his dreams in an unexpected accident, embarks on a cruise with his younger sister, Hui-Su. However, a mysterious virus spreads throughout the island, and monsters that take human heads attack. The protagonist is separated from his sister, and the only escape is the vast ocean. Will Su-Yeong be able to find his sister and safely escape the cruise?

(Source: Naver, translated)