Kiwadoi Futari: K2: Ikebukurosho Keijika Kanzaki Kuroki (2020)

Both have found family trope
The leads are secretly family.
In bitter blood the leads are estranged father and son
Where as in k2 the leads are step brothers
Both are cop comedies
Both have one case that needs to be solved for us to know what happened in their past.

Dorokei does not have family-like connection as K2, but it had many similar elements.
1. Detective-crime based story
2. Both have comedic elements
3. Has some revenge based flashback
4. Naive main male leads / new to the job
5. Bromance
6. Corrupted higher officials
I would definitely recommend giving this a try!

For everyone who likes bromance,this is perfect.They started off as a stranger and then they found out they're brothers.But then not again.Idk how to explain though. It's cute that the famale lead is not annoying at all and she's a student so,no romance included.