Kakao/The Male Lead is Obsessed with My Health

It's a novel reincarnation story, but it's still fun with great art, making it perfect for the 'wait 3 hours for free' model. The male lead is also a super sunny character, so it's not overwhelming. The plot is about a female lead who reincarnates as an extra with a limited lifespan. She's so frail that she faints just from running. There's a gathering of childhood friends, organized by the Empress for the male lead (the Crown Prince), where kids are supposed to play around. That's where she meets the male lead. When they were told to run during the gathering, she fainted. Ever since then, he keeps visiting her, obsessed with her health. The female lead's past life was quite sad, and around the latter half when her father appears, things get a bit funny and sad. Still, I totally recommend it!