- HD 1080
- Runtime: 124m.
- Status: Released
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- Languages: ko
- Country: South Korea
- Director: Lee Hwan-kyung
- Stars: Jung Woo, Oh Dal-su, Kim Hee-won, Kim Byung-chul, Lee Yu-bi
- keywords: corruption, self sacrifice, presidential election, ambition, house arrest, bromance, chief of police, korea president, kim dae-jung, korean democracy, korean dictatorship
- Production_studio: Little Big Pictures, 시네마허브, 환타지엔터테인먼트, Trinity Pictures
- Slogan: During the day friendly neighbour. At night suspicious wiretapping team. Enemy? or Friend?
- providers: Amazon Prime Video, Kocowa, Rakuten Viki, Amazon Prime Video with Ads
- The Best Friend is featured in the top rankings of 2020
- #39 in Top Comedy Movies of 2020
- #73 in Top Drama Movies of 2020
Daekwon is the team leader of the surveillance team on the verge of getting a demotion. His mission is to be as an unemployed head of a household and monitor the politician's family who's been house arrested right after arrival from abroad for 24 hours a day with his team. Members of the surveillance team, who have moved into the next door disguised as a neighbor, discover secrets one by one, through monitoring all the sounds and behaviors of suspicious family members, from requests for a radio show to midnight rustling noises…