The Negotiation
협상 (original)
An ace police crisis negotiator, Chae-youn (Son Ye-jin), is called to the scene where her supervisor is taken, hostage. Faced with the cold-blooded hostage taker, Tae-gu (Hyun Bin) over multiple video-calls, she tirelessly tries to crack him down, and eventually, the shocking truth begins to unveil.
Starring Son Ye-jin, Hyun Bin, Kim Sang-ho, Jang Young-nam, Jang Gwang, Jo Young-jin, Kim Min-sang, Han Gi-joong, Yoo Yeon-soo, Park Su-young
Watch "The Negotiation" on Tubi TV released in 2018. It's a action & adventure and crime movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.