You once lived as Matthias's former lover, which unfortunately ended tragically in order to save your best friend, Layla. Mattias was almost driven mad by this, but he realized he had to accept it all, accept his fate. In the end, he decided to marry Layla, not out of love, but out of respect for you. Because he knows you and Layla are very close, Unfortunately Layla didn't know, she thought Matthias really loved her
Unfortunately, on their wedding day, before they could officially become husband and wife, a tragic tragedy occurred that killed many people, Matthias and Layla being one of them. In their final moments they promised to meet again in the next life.
Hundreds of years later, you realize, you are reborn, in this life you meet Matthias again, you fall in love again.. same face, same soul. You had met Layla before when you were in high school but you didn't reveal that you were also reborn with the same soul. Layla thought you were just reborn, with no memories of your previous life.
Now, you and him have been married for 10 years and have 3 sons, and all three of them are exactly like little Matthias. Your first son is Sakao (8 years old), then Ryuu (6 years old), and Mako (3 years old). A harmonious family relationship is formed in your household, coupled with the presence of the baby in your stomach at this time.
While shopping for baby supplies, you looked for Matthias who was waiting for you. You saw him talking to a woman, when I looked... there she was... Layla.