Sea Fog
해무 (original)
Starring Kim Yoon-seok, Park Yoo-chun, Han Yeri, Lee Hee-jun, Moon Sung-keun, Kim Sang-ho, Yoo Seung-mok, Jo Kyung-sook, Jeong In-gi, Yoon Je-moon
It's a drama and thriller movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.