A rich girl and a lawyer has married and after 3 years he wants to divorce but his wife tell him she has 3 month to live so he decided to resist next to her untill her death.

Kim Soo Hyun's role reminds me of "It's okay not to be okay", such a man who is always calm and super kind, submissive to a strong and crazy woman, who is in love with him.
There is a palpable chemistry between the couple. They act very well.
I personally liked her aunt and also his lawyer friend.
My least favorite episode was episode 11th. When the bad guy blackmailed her, I hated these moments. A trash man who takes advantage of her weaknesses even though he knows she isn't interested in him.

The last episode disappointed me a lot.
She who still keeps him on edge with marriage (after what happened, hasn't she learned that life is short? She should have been the one to propose to him), the sight of his tombstone could have been spared, the brief glimpse of their daughter without seeing the joys of this event is a sin as is the hasty summary of all the stories, including the aunt's relationship.
Then, when he runs away from the hospital in his condition (absolutely not), when he is shot with all the special forces present and no one moves to see his condition (not real).

This series is compared in terms of share to the series "Crash landing on you" which still remains my favorite.
Certain scenes seem copied, for example the field of flowers at the end, but the sensations they convey are not the same.

NB: Is Mercedes a sponsor of this series by any chance? It wasn't clear enough.