After the Spouse Swap, He Fell Apart for Me

"The Shermans are the richest family in town, and both of the Sherman daughters are about to get married on the same day.I, the older of the two sisters, am about to marry Andrew Hammond, a wealthy scion and the man I've loved for many years now. Meanwhile, my younger sister, Celine Sherman, is set to marry the heir of the Wright family.The upcoming wedding fills me with joy and anticipation, but suddenly, Andrew disappears for three whole days.When I go to confront him about it, I end up overhearing a conversation between him and his friends."On the wedding day in three days, you guys must ensure that the wedding cars are switched, so that it's Celine's car that comes to the Sherman residence instead."That illegitimate son of the Wright family is a cold, heartless man. I can't let Celine suffer by marrying him!""Relax," one of his friends replies. "We've made all the arrangements with the drivers and everything. But what about Joanna?"Brimming with confidence, Andrew declares, "The Sherman family has the Wright family's business by the throat, and everyone knows that Joanna is mine. There's no way the Wright family would dare to do anything to her."When the time comes, I'll send Celine off and bring Joanna back for the wedding ceremony. I'm sure the Wrights won't dare to say a single word."The initial shock leaves me on the verge of a breakdown, but eventually, it morphs into the stillness of despair. In the end, I decide to go along with the plan, letting Andrew and Celine get their happy ending.Thus, when Andrew proceeds with the next part of his plan and arrives to pick me up, all he's greeted with is the sight of my cold dead body."