What could happen in one year? To most, a lot, and majority of the time things go wrong. To Chaeyoung, it's learning and learning and falling in love with Jisoo all over again. To Jisoo, it's mostly the same. But one year is a relatively short time, and perhaps, they could still learn a little bit more. After all, if they don't get it right the second try, third time will always be a charm, right? - [ROSIE'S RULE BOOK 2]

Raised in a fine, expensive household governed by people of big manners and aspirations, old money fashion heiress, Im Nayeon, never lets her eye off of what's important. And by "important", she only meant one thing: her well-established life. I mean, when she has a huge career, a fine reputation, a girlfriend as rich as she is (maybe even more), and no family drama, what else could she possibly ask for? But when Nayeon suddenly felt like a picture-perfect life isn't what she truly wants, she came upon a (very impulsive) decision of breaking up with her 6-year girlfriend and leaving her without any justifiable explanation. As she slowly regrets it, however, she stumbles upon Hirai Momo, the youngest rising CEO in Manhattan, New York, at a lowly café under the not-so-prettiest circumstances. Momo is everything Nayeon isn't: courageous, outgoing, unreasonable, carefree. She's a risk-taker; A dreamer; A rule-breaker, (and she may or may not be the reason why Nayeon will come close to bending a few, herself.) - [NAMO SIDE STORY]

All work and a little bit of fun. Roseanne Park, a rich, 27-year-old company CFO, isn't really one for emotional attatchments, the very reason why she never gets into serious, romantic relationships. How could she, when she's way too fond of the single, uncomplicated life? The night of her friends' engagement party at a luxurious night club in Uptown Manhattan, Rosie crosses paths with a fairly confident and attractive brunette, whom she learns, later on, to be Manhattan's oil heiress, Kim Jisoo. It was just supposed to be a friends-with-benefits sorta thing - not a single string attached - something Rosie made sure Jisoo understood, which she did. And as they went on with their strangely addictive, impossibly dangerous little game, lines between lust and love were drawn, stricly, by a certain rule Rosie decided would keep her in control of everything. However, when Jisoo seems to be a little too stubborn to keep her agreed promise, the highly-anticipated rich-people-drama starts.