In the shadowy corridors of Ahn Hyun, the second episode of "Connection" unravels a tale of high school betrayals and present-day mysteries. Jang Jae-kyeong, once a student who dared to report the criminal activities of his peers, finds his trust in friendship tested when Park Joon-woo, a witness, refutes Jae-kyeong's testimony, claiming ignorance of the incident. This event plants a seed of doubt in Jae-kyeong about the fragility of camaraderie.
The narrative leaps to the present, where Jae-kyeong's erratic behavior in the emergency room stirs discontent among the hospital staff. The doctors note symptoms of withdrawal, but Jae-kyeong reappears, nonchalantly disputing the notion of his condition, asserting his identity as a drug enforcement officer, not an addict. This dramatic scene, tinged with suspicion, temporarily concludes with Jae-kyeong's adamant denial and the growing sense of unease felt by Kim Chang-soo.
Jae-kyeong's search for answers leads him to confront Jang Cheol-gu in the hospital, questioning his involvement in the recent chain of events. Cheol-gu, however, seems as much in the dark as Jae-kyeong, only aware that a figure known as "Yoon Boss" is behind the illicit drug trade, a mysterious dealer whose identity and name are as fluid as the merchandise he peddles.
Kong Jin-wook, feeling abandoned by the enigmatic "Doctor," seeks a direct alliance with Yoon Boss, who, despite having once used Jae-kyeong's abduction as a bargaining chip, now extends an opportunity for partnership to Jin-wook. Meanwhile, Jae-kyeong uncovers CCTV footage confirming his orchestrated relocation by two unknown figures to a subway station, a revelation that deepens the enigma surrounding his situation.
At the police station, Jae-kyeong learns that the prosecutor assigned to the case is Park Jun Seo, and the absence of an autopsy raises more questions than it answers. A stolen glance at Joon-woo's phone reveals a series of calls with Oh Yun-jin, Won Jong Soo, Park Jun Seo, and Oh Ji-hyun, all in the hours preceding Joon-woo's death between 11:30 and 12:00.
Jae-kyeong's pursuit of the sender of a mysterious text message leads him to the hospital, where he discovers that Joon-woo's body has been hastily removed for a funeral. Confronting Yun-jin at the funeral, Jae-kyeong probes her about her last conversation with Joon-woo, met with a web of lies. Yun-jin denies any late-night calls, contradicted by the evidence of a face-to-face meeting.
Jae-kyeong implores Joon-woo's wife to demand an autopsy, an act thwarted by the arrival of Jun Seo and Jong Soo. He highlights the inconsistencies at the scene, such as the elevator's last stop not being on the ninth floor and the absence of footprints matching Joon-woo's shoes, casting doubt on the hasty conclusion of suicide.
The funeral reveals the lengths these self-proclaimed friends of twenty years have gone to support Joon-woo through his financial struggles, yet Jae-kyeong suspects their motives are not as benevolent as they seem. The arrival of a flower wreath from Xu Zhousong, an insurance company representative, adds another layer to the plot.
Flashing back to 2004, Jae-kyeong, newly promoted to a prestigious class due to his stepfather's position as the Minister of Education, finds himself at odds with the sycophantic environment. His discovery of the scholarship system being exploited by the class teacher leads to a confrontation, resulting in Joon-woo's one-week suspension and an unlikely friendship between the two.
In the present, Yun-jin uncovers the truth about Joon-woo's recent life insurance policy, taken out in the name of his company, with a clause excluding suicide as a payout event. This revelation casts further doubt on the possibility of Joon-woo's suicide, especially considering his subsequent visit to a lawyer to discuss his will, which bequeaths his company's shares to Jae-kyeong and Yun-jin.
The story weaves through the complexities of relationships formed in youth and tested in adulthood, where the line between friend and foe blurs, and the pursuit of truth becomes a labyrinthine quest for justice. "Connection" continues to captivate with its intricate plot and the haunting echoes of the past reverberating through the lives of its characters.