Jisoo and Haein have been married for 4 years. Young, millionaires, healthy and in love with each other, until something unimaginable happens. Meanwhile, Jennie and Lisa had been dating for at least 10 years, since they were teenagers, and had been living together for just over 6 years. Even with the difficulties and needs that they constantly went through, they had a daughter through artificial insemination, little Lia, only 5 years old, but something totally unexpected also happens. How will fate make these paths cross?

Sometimes you have to get what you want to realize it's not what you really need. You gave up on your first love because you don't have a chance for something more in the future, but that's where you meet your first crush. And so, in a fierce dispute between your 1st love and your 1st passion, where is your true happiness?