OK! Madam: Bon Voyage recap, summary, and ending explained

Main Setup

• Mi-yeong, who once stopped a plane hijacking, is now stuck in a strained family life—her husband Seok-hwan is unemployed, her teenage daughter Nari is distant.
• Hyun-min, a flight attendant she met during the earlier hijacking, invites her family to his wedding aboard a luxurious cruise ship. Mi-yeong pushes for this to become a family holiday. Her husband and daughter reject the idea, so she goes alone.

New Characters

• Onboard, she connects with Ji-hoon, a magician. Also Seon-ah, the ship’s CEO, and Anya, the criminal leader planning trouble.

Crisis

• Just before the wedding, Anya and her syndicate hijack the cruise ship. It’s a full-blown hostage situation at sea.
• Seok-hwan and Nari are kidnapped and brought onto the ship, which tips off Mi-yeong that there’s a much larger plot at work.

If you want, I can go deeper: twists, how Mi-yeong deals with it, spoiler-heavy details, etc.?

So: based on currently available information, it’s unknown whether the ending is happy or sad. If you’re okay with spoilers once they become available, I can help track down updates for the ending when more sources are published.