Best Friend

1985 year. Lee Eui Shik, who is about to run for president, is suspected of corruption, so intelligence officers are tasked with tracking him down. As a cover, the scouts move into the house next door and slowly rub into the man's confidence. But the longer the surveillance lasts, the more it seems to them that he is completely honest and has nothing to do with corruption. Is that so or is he just very good at pretending?