Boston Blue's Mika Amonsen has seen the Sean Reagan backlash after he was cast in the Blue Bloods spinoff in place of Andrew Terraciano. "There's been some negativity, for sure," Amonsen exclusively told Us Weekly about taking over the role of Donnie Wahlberg's onscreen son. "But when I look under those posts that have the negativity, there's a lot of fans rallying for Sean and people saying that they really enjoyed this character that I've created - or my version of character.