A Fantasy Romance Novel Set in the Entertainment Industry

[Out of ideas for now, so I'm setting this aside. I might change the premise.] The eldest princess of the Heavenly Realm was born without a heart. Knowing nothing of love, she had no choice but to descend to the mortal world and undergo a trial of love to advance her rank. The second princess followed her down to help, but in a moment of carelessness, she ended up in the body of her elder sister's archenemy: the rival who stole her man, snatched her opportunities, and tried to one-up her at every turn. After her memories awakened, Wu Sisi thought: I'm doomed! Sister, hear me out! We were sisters in our past life! Tao Zhenzhen frowned. "You seem seriously ill." Wu Sisi: "..." Tao Zhenzhen was born cold-hearted. All she wanted was to make money, but her career in show business was beset by setbacks. Then one day, her archenemy showed up with a stack of black cards, wrapped her in a tearful hug, and said, "Sister! Use all my cards! Please go fall in love!" Tao Zhenzhen: "...You're insane." Wu Sisi: #HowToGetSisterToFallInLove#, #ShouldISpendAFortuneHiringABoyfriendForHer#, #I'llLeadTheChargeAndShipSister#... Later, when scandal after scandal rocked the entertainment industry, Wu Sisi realized that no matter how many couples she shipped, sisters were still the most enduring pairing. What good are men? What makes them worthy of my fairy-like big sister?! The fans: Wait, aren't you two supposed to be rivals?! Theme: Friendship is something even more beautiful than love.