According to Nielsen Korea, the sixth episode that aired on April 9 garnered a national average of 4 percent in viewership ratings and a highest recorded rating of 4.8 percent. The fifth episode had recorded a national average of 3.5 percent.
On this episode of “Tunnel,” detectives Park Kwang Ho (played by Choi Jin Hyuk) and Kim Sun Jae (played by Yoon Hyun Min) launched an investigation into a case of identity theft. They soon found out that six other victims had gone through similar cases during the previous year. After examining the related incidents and looking for connections between them, the detectives managed to arrest the suspect, who confessed to committing the crimes out of jealousy. The episode then ended with Kim Sun Jae growing suspicious of Park Kwang Ho’s true identity.
Watch the first episode of “Tunnel” on Viki!