Both had a time travel experience with a thought of changing their present life by unmeeting their wife/husband. Characters showed regrets from their past and had a deep contempt for their partners. But then both realized in the end that what happened, happened for a reason,they met for a reason, they fell in love for a reason, it might be fate, or destiny but for me that main reason would be the fruit of the love they once shared and had, their children, and then that's when it came to their mind, that even having that chance to travel back in time and change their ways, make up with their regrets, they would still choose the same path that led to having that little bundle of joy and love that was the result of everything.

Both have a blind female character and the male character also have something to hide from his identity.