
In the original, Jeremy was obsessed with the FL of the novel, but in this life he won't be. He loves his sister dearly, so after they bring their father down (the whole family, or better said their children) Roxanna didn't have anywhere to go and she didn't want to stay in the family no longer. That is when she wanted to kill herself and our ML jumps in and tells her if she doesn't want her life anymore, she should just give it to him (and that is kinda a confession) so she will live as long as he tells her too. Jeremy was so sad for her sister so he started rebuilding the family and giving Roxanne a place to return to if she ever wants. As for Dion, he kinda disappears after that accident (but don't quote me on that cause I'm not sure). Also you can see all the other spoilers here https://forum.novelupdates.com/threads/the-way-to-protect-the-female-leads-older-brother-%EC%97%AC%EC%A3%BC%EC%9D%B8%EA%B3%B5%EC%9D%98-%EC%98%A4%EB%B9%A0%EB%A5%BC-%EC%A7%80%ED%82%A4%EB%8A%94-%EB%B0%A9%EB%B2%95.120098/
I'm sure the ending is gonna break my heart, cuz i really wish there's a bit of goodness in Dion and Jeremy...guess not