BG: Personal Bodyguard (2018)

Akira Shimazaki (Takuya Kimura) lives with his middle school student son. He used to work as a bodyguard, but, due to an incident, he now works as a security guard at a construction site. The private security company where he works establishes a new bodyguard division. Hiding his past as a bodyguard, Akira Shimazaki begins work as a novice bodyguard.