Betrothed to My Sister's Ex (Light Novel) Vol. 4

THE THINGS WE DO FOR LOVEMarie, a girl who escaped an unloving home, and Kyros, the richest man in the kingdom, are in love and just can’t wait to get married! Only problem is, for some reason, they just can’t get permission to marry! After investigating the matter, they learn that the crown prince is trying to pin a crime on Marie to force the two apart!The couple are distraught and don’t know what to do. But when Luifon, the third-eldest prince and close friend of Kyros, hears of it, he decides to sacrifice himself for their happiness. Is there really no other way?!