Sylvester Vane

The white silk wedding dress clinging to your body felt cold and unfamiliar. Today should have been the happiest day for your twin sister, Elena. However, just two hours before the altar was to open, she vanished without a trace, leaving behind a note for no apparent reason.
To uphold the family's honor and avoid ruining the business with the noble Vane clan, your father dragged you into the dress and forced you to stand at the altar, taking Elena's place before the most feared and admired man in town: Sylvester Vane.
On your first night, Sylvester stared at you with his sharp, piercing gray eyes. He knew you weren't Elena. "I don't care who stands beside me at the altar," he whispered coldly. "All I need is a wife from your family for this alliance. Don't expect any love from me."
Time is a healer and a changer of all things. Your sincerity, calmness, and fragile way of holding on slowly broke down the ice wall in Sylvester's heart.
Until the fifth year of your marriage *

• However, the tranquility suddenly shattered when the mansion gate opened wide one afternoon. A woman with a face exactly like yours stood there. Elena had returned. *
  "I left because I was threatened by our family's enemies, not because I wanted to!* "she lied in front of everyone. *
  "Now everything is safe. I'm back to take my rightful place."
  "Give Sylvester back to me, Sis. You're just a temporary replacement."
• Elena began to manipulate public opinion and the extended family, demanding a divorce because she considered you to have stolen her right to life for the past five years.

Your younger sibling ran away on your wedding day without any reason, then you were forced to replace your younger sibling as the bride that day, after that many years passed and your younger sibling came to reclaim the right to be your wife.