As explained in flashbacks, the pair turned to a life of crime after Edgin's wife was murdered for his work as a member of the heroic Harpers, helping provide for his daughter Kira (Chloe Coleman).

Source: https://www.cbr.com/dungeons-and-dragons-movie-review/

Edgin explains that he's actually come from the Harpers, one of the most secretive peace-keeping factions in the Forgotten Realms.

Source: https://gamerant.com/honor-among-thieves-dd-backstories-players-steal-cast/

Ministers Sigrid Kaag (Finance) and Mark Harpers (Infrastructure and Water Management) described compliance with the subsidy terms as “disappointing”.

Source: https://houstonianonline.com/klm-ignores-the-terms-of-state-aid-the-cabinets-patience-ran-out/

Often their performances as Bards, either in songs or stories, carry hidden messages that only other Harpers will be able to understand, hence the name of the faction.

Source: https://gamerant.com/dungeons-dragons-honor-among-thieves-harpers-facts-lore-trivia/

Since members were spread across the nation and rarely in contact with each other, any given Harpers' methods varied.

Source: https://gamerant.com/dungeons-and-dragons-movie-harpers/

While The Harpers played a significant role in ungeons and Dragons: Honor Among Thieves, their history within the game is even greater.

Source: https://screenrant.com/dungeons-dragons-honor-among-thieves-harpers-secret-organization-explained/

Who Are The Harpers In Honor Among Thieves?

Source: https://screenrant.com/dungeons-dragons-honor-among-thieves-harpers-secret-organization-explained/