Similarities:
1. Language barrier for participants of the show
2. Cooking

Differences:
Unexpected Business - a grocery store as well as a small restaurant
Yoon's Kitchen - only a restaurant

Overall, both shows are very cute and fun.

- Both have FLs that travel back in time after leading a treacherous life where they were the villain.
- Both have FLs that become better women after they go back in time and try to lead a good honest life.
- ML in Story of Kunning Palace is more violent than the ML from Scent of Time.
- Overall Scent of Time has a lesser-known FL, but is DEFINITELY worth a watch.