Undercover cop that only his father knew his real identity. His father was interrogated by his enemy about who he really is.. His father shouted ” he’s my son… Badge/mission number…” something like that.
He got arrested by police. Told them he is undercover. And revealed his real identity and the badge/mission number.
.. He is disguised as a troublemaker bystander, his father is disguised as his neighbor. He keeps on getting arrested for drugs or any troubles but after a day he is always immediately released..