This reminds me of the novel/manhwa titled something like the youngest chaebol or smthg with mc having rich grandpa letting him learn 'bout business and yeah
Is it The Chaebeol’s Youngest Son? The story is like MC was a secretary for the chaebol family and did illegal stuff for them but got murdered cause one of the grandsons thought he's too OP(?). But in his next life, he returns to the past as the youngest (?) grandson of the same family.
This reminds me of the novel/manhwa titled something like the youngest chaebol or smthg with mc having rich grandpa letting him learn 'bout business and yeah