Forgotten
기억의 밤 (original)
When his abducted brother returns seemingly a different man with no memory of the past 19 days, Jin-seok chases after the truth behind the kidnapping.
Starring Kang Ha-neul, Kim Moo-yul, Moon Sung-keun, Na Young-hee, Nam Myung-ryeol, Lee Na-ra, Bae Seong-il, Lee Soon-won, Byeon Dong-joon, Jung Chan-bi
Watch "Forgotten" on Netflix released in 2017. It's a drama and mystery movie, and has a rating of 7.4 out of 10 from Imdb which is usually fine for this kind of movie.