After learning about Yang Kum-ji’s human trafficking operation, Yona volunteers to go undercover as one of the captives. Her goal is to infiltrate his ship and fire a signal to let the pirate crew and the dragons know the hostages' location.
You can watch the full episode on platforms like Crunchyroll or Hulu. Akatsuki no Yona Episode 20
This episode is a standout for rather than just action. It marks the first time Yona devises a high-stakes plan herself and forces her "protectors" to trust her. It also showcases the rare "surrogate mother" dynamic between Captain Gi-gan and Yona, providing Yona with a strong female role model she’s never had before. Akatsuki no Yona Episode 20
[Rewatch] Yona of the Dawn - Episode 20 Discussion : r/anime Akatsuki no Yona Episode 20