I Accidentally Saved the Male Lead’s Brother

Read manhwa I Accidentally Saved the Male Lead’s Brother / I Accidentally Saved the Male Lead’s Younger Brother / 얼떨결에 남주 동생을 구해버렸다
She possessed Charlotte Rania, an extra that was not even mentioned in the original book. I only thought that the bloody social world and politics were stories from another world. Until she accidentally met her brother-in-law and saved him. But… “Theo is going to live with you!” This little kid started swearing that he wouldn’t go home. The male protagonist, Carlyle Heinst, who has to marry the original female lead by contract, offers Charlotte her contract marriage… A peaceful extra life, goodbye now!