Thankfully, Beckett only ended it to protect Castle, which meant that a reunion was inevitable. And in the midseason finale for season 8, 성 and Beckett celebrated their first wedding anniversary with the greatest gift of all: reconciliation.
Gates ultimately finds out about Castle's mob ties and has no choice but to let him go from the NYPD. What does this mean for Beckett and Castle? 성 is embracing a new profession -- a private investigator.