Dressed as a Cannon Fodder Boyfriend in School [Rebirth]

[Probably a story about thinking that I was actually reborn after passing through a book] [Tentative title] Bai Haitang didn't expect that he would travel into a book. The protagonist in the book has the same name as him. He has a tall, handsome, and rich boyfriend who is the school sweetheart. He is often flirted with until his knees are weak, and he dresses like this protagonist. Bai Haitang couldn't help but fell into deep thought. The two of them were going to break up in the book anyway, so why not accept the pursuit of the school sweetheart. Then... It smells so good, the school grass is so pretty, and the abs are so fun~