Their synopses are very similar:
- female lead marries the father and becomes a stepmother to the male lead
- female lead is trying to take revenge for her family
- the leads both know each other from the past
- both are short series
- time periods are roughly similar

Plot is nearly identical, both main characters are stuck in a time loop trying to save their loved ones. The ending of both of them are also quite similar.

Both the female leads have to raise a child by themselves at the beginning. They also both meet the male lead sometime in the past, separate ways because of some misunderstanding or situation, then reunite after a few years.
Male leads are also both kind of petty and arrogant at the beginning because of what happened between them in the past, and eventually warm up to the female lead after they getting to know them better.