[The heroine's perspective]
In my last life, I betrayed you for others, but when I was killed, you still took a shot for me. At that moment, I realized that I only loved you, but it was too late. When the doctor told me that I had terminal cancer, I no longer had any idea to live.
In this life, I am only here for you.
[Male protagonist's perspective]
I don't care what your identity is, I only know that you are the one I love, and I will never let you go again
So is this a story that starts out to torture a heart and ends up torturing a dog?
The heroine started out as a wealthy second generation who only cared about herself, and was quite willful. Later, she gradually grew up, but occasionally she would still be arrogant and coquettish. The male protagonist would only act coquettishly in front of the heroine (must be because of intrusion or something). He was very cold in front of other people, and he was very loyal but occasionally he would be domineering or something.
Then it's definitely not a pit, but I can't guarantee when I'll be able to fill it in.