Both are mini dramas in which the FL is out for revenge against a husband or boyfriend who wronged her.
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Both are Republican Era dramas in which the FL's family is destroyed by either the ML or his family.

Both are Republican Era dramas. Both MLs are military leaders with a cold outside/warm inside personality, while the FLs are studying in the medical field and are a little immature and innocent. The couple clash at first.

Both are romances in which the ML travels through time and tries to prevent a tragedy. Both have a similar tone and pacing.

Both involve time travel and loss, with the lead trying to save a loved one. One is a parent child relationship, the other a romance.

Both involve one of the leads traveling back in time due to an object to save the life of the other lead who died in an accident.

Both are about one of the leads traveling back in time and trying to prevent the death of a loved one in an accident.

Both involve time travel.
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Both involve time travel.
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Both involve time travel.
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Both involve one of the leads traveling back in time due to an object and trying to save the life of the other lead who died in an accident.

Both are love stories in which the ML travels back in time and tries to save the FL they loved who died.