Asian romances are famous for the "white day" confession (snow) or the "umbrella share" (rain). The diary allows you to sync emotions with seasons. Spring = First love/Cherry blossoms. Winter = Breakup/First snow.
The climax of their romance wasn't a confession in the rain, but a trip to Kyoto. Standing under the blooming cherry blossoms, Jun finally read one of his diary entries to his grandmother. Hana stood a few feet away, sketching the scene. Jun looked back at her and realized that while the diary was meant for the past, his future was standing right there with a sketchbook in hand.
Netflix, Viki, and Disney+ are pouring billions into this content. The are no longer a niche hobby; they are a primary source of emotional sustenance for a generation that feels lonely.
Chinese dramas, particularly the Xianxia (fantasy) and Wuxia (martial arts) genres, offer romance on a cosmic scale.