Demon's Sweetheart

Demon's Sweetheart manga summary: Several years have passed and my parents were gone, it's he who, the man of no kinship with me, was appointed the only successor of my parents' company and real estate. Samson: Till the day she is 18 years old. I won't be her guardian any more. According to her father's will, all will be over. And I will become her legal husband.