Eunjung, Jiyeon, and Hyomin wake up in some dingy hotel room, right in the middle of Bangkok. Hyomin's fiance's sister Qri is missing. They don't remember what happened, since last night. The only thing they have as clues is a severed finger, a tattoo that was a total mistake, and a tiny monkey.

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Ham Eunjung - A married school teacher who loves bachelorette parties. Slightly a narcisstic playgirl who always complains about her married life. Sometimes a jerk by embarrassing Hyomin that she's a dentist and not a doctor. A joker and a swear fanatic. 

Park Jiyeon - A child at heart, somewhat dimwitted, and lovingly insane. She idolises Eunjung for her tough demeanor. Actually a genius to things people aren't usually good at.

Park Hyomin - A responsible, uptight, worrying little coward. Can be a huge wimp, but freaking insane when drunk or drugged. She has become very selfish about her wedding in Thailand and how the bachelorette party is going. At first, she didn't want a party, but of course Eunjung had to force her into having some fun.

Lee Qri - A pre med student in a medical university. She is a soon to be sister in law of Hyomin. They take her along to have their "harmless" celebration, only to be mysteriously drugged and missing the morning the trio wake up in the hotel room.

Park Soyeon - Extremely crazy, loud, psychotic, very rude, funny, and to top it off . . a international criminal/gangster.

Jeon Boram - The childhood bestfriends of Eunjung, Jiyeon, and Hyomin. She's already married and is very mature. Helps the trio out to find Qri.