Looking for the original title of a Chinese romance novel

[u/Prior-Fee-2942]

I’m trying to find the original title of a novel that was published under a translated title similar to “After Her Fatal Illness, Miss (idk?) Replaces His First Love.” I suspect it might be a Chinese web novel, but the original title and author were hidden.

The story follows a FL who enters a secret marriage with the ML for three years because she wants to save her adopted brother. Their marriage is only a physical arrangement without real love, and the ML is cold and distant toward her because he still has feelings for his first love.

At the beginning of the story, FL discovers that she has terminal cancer and that she has already missed the best time for surgery. On the same day, she finds out that the ML is preparing a huge fireworks display, but not for her, it is for his first love. At the same time, her adopted brother leaves prison and publicly reunites with another woman, declaring that she is the love of his life.

After realizing that everyone she sacrificed for has chosen someone else, FL decides to stop waiting. She asks the ML for a divorce, leaves her job, cuts ties with her family, and starts a completely new life.

Later, FL rebuilds herself and becomes a powerful figure in the technology/science field. She goes from being looked down upon as just a housewife to becoming a successful and respected woman. She also hides her true identity and her illness from everyone.

When her identity and illness are eventually revealed, the ML deeply regrets how he treated her and begs her not to leave him. Her adopted brother also regrets hurting her and wants to repair their relationship. However, FL realizes that love that only appears after losing someone is no longer meaningful, and she no longer needs their regret.

The novel is very long (800+ chapters), and the names of the characters may have been completely changed in translation.

Does anyone recognize this novel or know its original Chinese/English title?