Forgotten (2017)

Jin-seok, 21-year-old, moves into a new house with his family. One night, his beloved brother is kidnapped before his eyes. After long silence of 19 days, suddenly Yu-seok returns home. And soon Jin-seok feels Yu-seok is a total stranger.
Crime, Mystery, Thriller · Starring Kang Ha-neul, Kim Mu-yeol, Moon Sung-keun, Na Young-hee