@MagiciansBlack
A spy is loyal to a organization and/or country, and follows orders from them while the assassin pretending to be the mom, her affiliations are more loose, being someone who is paid to kill and any allies are more likely to be in their self interest
@BurriedBay Thanks for the clarification. They changed his mission to information gathering on the serialization though, maybe the editors thought it was confusing too.
Definitely a manga worth reading if you like action and comedy, an assassin a psychic and a spy in one roof and each not knowing their true identity. Read through episode 4 in some Chinese manga website, very hilarious!