The Untouchable Ex Wife by Mizuki Sei

Chapter 1510
Renee instantly knew what Stefan wanted, and said bluntly," No way!"
Defeated, Stefan went to rest in the storeroom in the backyard alone, yearning for Renee. The minute he entered the room, his
mind went back to the strange sketch of his mother that he saw, and he decided to search the room to find clues. After all, if
something had happened between Renee's father and Stefan's mother...
Renee and Stefan might actually be siblings.
After locking the door of the workroom, he checked the books on the bookshelf until he found something that looked like a diary.
He picked it up and found that it was locked. It seemed inappropriate to take a peek at his father- in-law's diary, but at last, his
curiosity won out. Generally, people used the birthdays of their loved ones as passwords, so Stefan tried Renee's father, mother,
and her birthday, but the lock did not open.
"Could it be my mother's birthday?" At the thought of it, anxiety overwhelmed him. If the password was his mother's birthday, the
possibility of him and Renee being siblings would be much higher.
Francine’s birthday was the 31st of March, and she was a typical Aries. She always spoke her mind and had a bad temper, but
she had a kind heart. Stefan tried keying in Francine's birthday, and... the diary unlocked.
"Oh no..." His mind went blank, and he took a deep breath. His fingers were cold, but he forced himself to open the diary and
read it.
[X month X Day. It's a sunny day, but I'm feeling sad. It's been five years since I separated from Francine, and though I thought I
had moved on, one gaze from her at the charity ball was enough to make my heart race. I can't calm my mind... I know I'm a
terrible person-l've been blessed with a good wife and a cute daughter, but I just can't let this go. I guess that even if the sun is
down, the moon can't be replaced."
Even if the sun was down, the moon couldn't be replaced? What did that mean? So Stefan's father-in-law still thought about
Francine even after getting married and having kids. Wasn't that considered an emotional affair?
Stefan calmed himself down and kept on reading the diary.