Yoo Ryeong became a police investigator in order to find her missing twin sister. She was disappointed because the report of losing her sister was ignored by Ha Ma-ri, the police officer at that time. She thinks her sister was a victim of a serial murder by the Subway Ghost, and she does not always follow the rules as she strongly believes in justice. She partners with Go Ji-seok. On the night of her shift, with the help of Kim Woo-hyuk (a police officer at metro who is interested in her perseverance), she searches for her sister in a tunnel without her boss knowing. Meanwhile, Go Ji-seok became famous because of his looks, and for being the best police officer in his class. He gets a promotion to be a metro police officer with his then girlfriend Ha Ma-ri, but circumstances force him to be a police officer at the subway, and that leads to his breakup with her. Unlike Yoo Ryeong, he strictly follows the rules and doesn't like trouble. His partnership with her thus leads to many problems for him. However, due to Yoo Ryeong's sincerity for every case, he begins to think about his past. Later, Yoo Ryeong wants to separate from her partner because she doesn't want to always depend on him. Ji-seok is devastated, but he understands his partner's decision. Inspector Gong, Yoo Ryeong's new partner, is frustrated with her antics. Yoo Ryeong and Ji-seok work together to solve a kidnapping incident at the subway. After their collaboration, the two realize they miss each other. Knowing that Inspector Gong can no longer handle Yoo Ryeong, Ji-seok makes a deal to take back Yoo Ryeong as his partner without her knowing. They become partners again, to catch the Subway Ghost together with their team, and to search for Yoo Ryeong's sister.
Catch the Ghost was supposed to premiere on August 26, 2019, but was pushed back to October. tvN decided to air The Great Show first as the series completed its production.[8]
Knowing you have a family who will return if you wait...
3.694%
3.918%
3
October 28, 2019
Disciplinary Hearing
3.000%
3.077%
4
October 29, 2019
Tracking Down the Grasshoppers
3.362%
3.817%
5
November 4, 2019
Club Day
3.001%
3.225%
6
November 5, 2019
A Petty Thief?
2.438%
2.582%
7
November 11, 2019
Jealousy & Confusion
2.712%
3.161%
8
November 12, 2019
Facing the Harsh Truth
2.942%
3.109%
9
November 18, 2019
Getting Closer to the Subway Ghost
2.424%
2.617%
10
November 19, 2019
The Hideout
2.431%
2.388%
11
November 25, 2019
Going After the Grasshoppers
2.240%
2.610%
12
November 26, 2019
The One That Got Away
2.755%
3.279%
13
December 2, 2019
The Grasshoppers Are Behind Bars
2.790%
3.262%
14
December 3, 2019
The Subway Ghost Reveals Himself
2.935%
2.767%
15
December 9, 2019
The Subway Ghost's Method
2.598%
2.775%
16
December 10, 2019
Finally Catching The Subway Ghost
2.671%
2.893%
Average
2.884%
3.143%
In the table above, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
This drama aired on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).
^The main character's name is written the same way as the word "ghost" in Korean, thus the literal translation of the title could be the same as the official English title or Catch Yoo Ryeong.
^Lee Ji-sun (October 29, 2019). "'유령을 잡아라' 백서이, 청순 이미지 벗고 반전 연기력 뽐낸다" ['Catch the Ghost' Baek Seo-yi takes off her innocent image and shows off her acting skills] (in Korean). Herald Pop. Archived from the original on August 23, 2021. Retrieved August 23, 2021 – via Naver.
