You are my heartbeat

Everything seemed to be normal until an unexpected marriage that changed her life. Shen Ning once vowed that she would never get married because she loved someone else. But due to a misunderstanding they weren't together...and decided to let go of her feelings for him.
After being married for almost half a year, she realized that her husband was considerate of her so she decided to take her marriage seriously.
Then what will happen when her long time crush comes back to her and clear the misunderstanding? Will she rekindle her feelings for him? Or will she keep the promise she made to her husband to grow old together with him?

Husband vs seven years long crush