King is very savage and a revolution took place against him to overthrow the king
Also, in both dramas there was a group of people where helping out poor people

1. The male lead is the same actor
2. The heroine have illness and tries to achieve list of wishes before she die and the male lead helps her in that

- both have the same story: the main guy is attacked because he is the heir which results him to lose his memories and live with the heroine a poor life
- same main actress
- however, '100 days my prince' is a historical drama