Love is full of ups and downs!

In the current Republic of Korea, secondary genders are basically divided into Alpha, Omega, and Beta, with the rare subtypes being Solar Alphas and Lunar Omegas. Lee Hwan-young: the sole legitimate eldest son of the modern royal family, the nation's top celebrity, and a notorious troublemaker. The selection process for his Crown Princess has begun. Since he is a Solar Alpha, Hwan-young's partner must be a Lunar Omega! And here we have Cha Kang-yeon, an ordinary citizen who was unlucky enough to manifest as a Lunar Omega. Since childhood, he has struggled to hide his secondary gender to avoid becoming the Crown Princess, but then, out of nowhere, the very Solar Alpha he wants to avoid mos...