What if....*spoiler alert*

it seems not quite possible

There's too many people involved for that plot to work. The west kowloon department was ransacked the twice. If it was done by the same cop, wouldn't the officers recognize Ho, the second time he came in?

They are clearly two different characters as the opening scenes show us. Bun is an ex-detective known to other force members and Ho is another cop wanting to climb the promotional ladder.🐭