What are the biggest fan theories about her hidden identity?

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🕵 Fan theories about her hidden identity

1. Her husband (Kwon Tae-Seong) will figure out she's Kingfisher, but keep it secret Fans believe Tae-Seong’s investigative reporting into Kingfisher is headed toward discovering Bo-Na is the sniper—yet, out of love or conflict, he may choose to protect her rather than turn her in.

2. She’s not acting alone or entirely solo While Boo-Na is Kingfisher, many speculate there’s a shadow network behind her: perhaps the “Sales Team 3” at Durumi Electronics is actually her crew, helping her plan and execute operations. That way, Kingfisher’s methods—hacking, poisoning, accidental “deaths”—suggest multiple specializations beyond just sniping.

3. Her return from maternity leave triggers past connections or vengeance guilt Some think her hiatus wasn’t only about family—it may be tied to a traumatic past event: maybe her previous targets, someone she thought was eliminated, returns, or she’s covering up for earlier moral missteps.

4. Her secret identity has a link to law enforcement or justice system insiders The detective Lee Dong-Jin and her journalist husband are both pursuing the truth; theory holds there may be overlap—someone in the police, legal, or criminal justice field might recognize her style or have worked with/against her before.

5. Kingfisher is more myth than fact—maybe others are using her name Fans wonder if the legend of Kingfisher has become bigger than the individual: perhaps someone else takes advantage of Bo-Na’s reputation, copying her methods or framing her, which will force her to both protect her name and unmask the impostor.

6. Her identity may tie into her “ordinary mother” persona in a twisted way Since Bo-Na is balancing motherhood and killing, there are theories that her child or a family member may, at some point, discover or become part of her double life—accidentally or intentionally—and that this will become a catalyst for her identity being exposed.

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If you want, I can dig up more recent or strong evidence for any of these — or list which ones seem most likely based on foreshadowing.

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Sources: Reddit threads about character posters, plot summaries, and fan discussions; official drama synopses.