Arrest and Action

Similarities: Both feature SkyNani as the male leads and both series are Shounen-ai.

Differences: Arrest and Action is an action comedy series about police officers whereas Wu is a fantasy series about fighting demons.

Similarities: Both series are centered around a police investigation and both series are Shounen-ai.

Differences: A&A is an action comedy series focused on the film industry and Mr. Kill is a murder mystery drama.