The Male Lead's Older Brother

From the heroine's perspective: I was the original story's second female lead, but now I've transmigrated into a baby and become the heroine. I love my family very much, so, original male lead, let's talk about your ideas about love. From the male lead's perspective: I'm the original male lead's older brother. I've fallen for the original second female lead, so, little brother, can you be eaten? In one sentence: Big brother of the male lead, cut it out! I'm trying to save your little brother's ideas about love! Reader's guide: 1. A transmigrate-into-a-book story, set in a Mary Sue-style school romance made up by the author. Any similarities are purely coincidental. 2. Happy ending, lighthearted, with a little snark. The heroine is sweet and naive, and the author is too dim-witted to pull off scheming and intrigue. 3. The heroine isn't naive, and has a touch of a queenly personality. The male lead is devoted and loyal, with a little role reversal as the heroine shapes him. 4. If this story suits your taste, go ahead and add it to your collection O(∩_∩)O~. If you like the author, click through to my profile and follow me too! 5. Feel free to point out typos, and please leave lots of comments. This clumsy author isn't great with words, but I'll try to reply to every comment. Love you all!