I'm the Antisocial Younger Brother of the Twins' Beloved [Book Transmigration]

Lin Yuqing is the one and only protagonist of the novel Everyone's White Moonlight. He's handsome, clever, and exceptionally talented... practically capable of anything. He's the center of everyone's attention and the white moonlight in the hearts of every powerful figure. But almost no one knows that Lin Yuqing has a twin brother. Lin Yubai, who transmigrated into a book and lived a new life, is a homebody who loves staying in, has social anxiety, and is frail and sickly. He's delighted that nobody notices him. It would be even better if his white-moonlight brother didn't keep asking him to fill in for him. PS: The main character is the top. Lin Yubai is the top. PPS: The author's brain has gone haywire. Theme: Persevere and strive for self-improvement