Tunnel Episode 4

Kwang Ho puts out the fire that broke out on the first floor of his apartment and realizes that the lady who studies maniacs, Jae Yi, is living downstairs. Meanwhile, Sung Shik gets suspicious of Kwang Ho’s identity and tails him. While Kwang Ho still hasn’t figured out the way to go back to the past, an organized case of theft occurs in his jurisdiction. (Source: thetvdb)