Connection: Episode 10 Recap

Cast

Ji Sung as Jang Jae-kyung, a detective of the Narcotics Team at Anhyeon Police Station

Jeon Mi-do as Oh Yun-jin, a social affairs reporter of the Anhyeon Economic Daily

Kwon Yul as Park Tae-jin, a prosecutor at Ahn Hyun District Office

Kim Kyung-nam as Won Jong-soo, Geumhyeong Group's successor

Yoon Na-moo as Park Jun-seo, the central figure in the incident

Jung Yoo-min as Choi Ji-yeon, Jun-seo's wife

Jung Jae-kwang as Kim Chang-soo, Jae-kyung's teammate

Cha Yup as Oh Chi-hyun, Jong-soo's chief secretary

Jeong Soon-won as Heo Joo-song, CEO of Two Star Holdings, an insurance company

Park Geun-rok as Jung Sang-ui, a researcher at Geumhyeong Pharmaceutical

Connection: Episode 10 Recap 

Jun-seo is leaving a movie with friends when he receives a call from Sang-ui. It appears that Jong-soo assaulted Kyung-tae and set his house on fire, resulting in Kyung-tae’s death. The opening of episode 10 flashes back to their high school days. 

​Back in the present, Jae-kyung is searching for Yun-ho on the run for being accused of murdering the mill owner but fails to catch him. Along with Yun-jin and Joo-song, he follows Ji-yeon, who is being pursued by Yun-ho. 

Jae-kyung obtains and listens to a wiretap recording of a conversation between Ji-yeon and Tae-jin. Ji-yeon questions Tae-jin about the relationship between Yun-jin and her deceased husband Jun-seo. Tae-jin initially denies any connection but eventually admits they briefly dated in high school. 

Jae-kyung confronts Jong-soo, asking if he killed Lee Myung-guk, a researcher at Geumhyeong KHPHARMACEUTICAL. He also pressures Jong-soo with the fact that he’s using drugs. 

A drug dealer Gong Jin-wook's subordinate, Geun-ho, disobeys orders and approaches Ms. Yoon for debt collection. Ms. Yoon captures Geun-ho as a hostage to lure out Jin-wook, planning to exchange him for the direct line to the Doctor. She calls Chang-soo, Jae-kyung's subordinate of the Narcotics Team at Anhyeon Police Station, offering to hand over Jin-wook and Geun-ho for arrest. 

Ms. Yoon plans to turn Jin-wook over to the police, but Jin-wook shoots her and escapes with Geun-ho. The gun used was one he had taken from Jae-kyung, putting Jae-kyung in a more difficult position. 

Jae-kyung realizes that Ms. Yoon’s torture room matches a place from his memories, leading him to discover that Ms. Yoon had drugged him. He questions the fallen Ms. Yoon for the truth, but she dies without answering. Jae-kyung notices something suspicious about his subordinate Chang-soo but does not reveal his suspicions.

Ms. Yoon’s henchman, Go Ki-seong, is arrested at the scene. Being transported to the police station, he tries to blackmail Chang-soo, revealing the truth about Ms. Yoon’s relationship and Jae-kyung's addiction to secure his release. Chang-soo, refusing to deal with the criminal, decides to silence Ki-seong by driving the car into the river. Arriving at the scene of the incident, Jae-kyung finds it odd that the driver’s window of Chang-soo’s car was open, making the accident seem suspicious. 

Yun-jin, claiming to know the password, lures Tae-jin to an internet café. She is confident the password is her six-digit birthdate and proposes splitting the money. To protect herself, she has set up a safeguard to expose Tae-jin and Ji-yeon's relationship to the media if she’s threatened. However, the password turns out not to be her birthday, much to her amusement. 

As Tae-jin, frustrated by multiple failed attempts, is on the verge of losing all the money, he starts strangling Yun-jin. Out of nowhere, Joo-song appears, demonstrating incredible strength as he throws Tae-jin aside, rescuing Yun-jin. The episode concludes with this dramatic rescue.