I Kidnapped the Billionaire's Son

As an illegitimate child, Louie already stopped asking for love and understanding. He takes all the blame, unreasonable or not, on whatever bad things happening in the family until their family slowly loses the brilliance they once had and the company collapses. Louie might be an illegitimate child but he grows up with all luxury and also unable to adjust in the poor life. Because of fatigue from doing 2 jobs a day, he muddled and fell in the stairs, dying.
Once he returns in his 12 year old body before he returns in the main house, he grumbles thinking how useless for him to have rebirth but there's one thing that his past self can do, save the billionaire's kidnapped child from clueless cannon fodders before he died from abuse!
How can he do that?
Kidnap him!