A scheming, two-faced puppy-like younger guy vs. an older sister who thinks she's clear-eyed and always takes his side
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Both leads are reborn
The heroine is reborn at seven and only wants to figure out why the hero, who barely registered in her life, fell so deeply in love with her that he chose to follow her to the grave in such a decisive way.
But after she's reborn, she discovers she's not in a story about redemption. She's in a childhood-sweethearts-to-lovers story.
The leads' feelings deepen gradually from childhood, and everything unfolds naturally.
The hero is reborn at fifteen. He sneaks a look at another boy confessing to the heroine, and the boy hiding beneath the tree is struck by lightning. When he wakes, he's the hero from his previous life, who died after drinking paraquat. He's jealous that his present-day self had such a happy childhood. He wants the heroine to love him, but he doesn't even know if the person he was before fifteen was really him. The hero has had personality issues since childhood. Worse still, after being reborn, he's never received the childhood salvation or healing he needed, leaving him obsessively and crazily jealous of everyone, even himself.
The heroine knows the hero well and naturally notices something is wrong. Her understanding, acceptance, and unwavering trust soothe him, helping him gradually reconcile who he was before fifteen with who he became afterward, and build a happy life in this incarnation.
*
My name is Wu You. My mother gave me that name. She said I was born prematurely, tiny and frail, and it wasn't easy for me to survive. She always says a little girl should grow up cherished and adored. She hopes I'll always have someone to protect me and be a carefree little one, free as the wind.
My name is Cheng Guang. My grandmother gave me that name. She said I came into this world at daybreak, when the morning light was faint. She hopes my life will always have light to guide my way forward.