Her Revenge Is Absolute

In her past life, an heiress was killed by her socialite colleague and boyfriend after being framed for an 8-billion fraud. Reborn, she turns the tables at an auction where her colleague sets a trap. She thwarts the payment scheme with a children's watch, exposes her rival's fainting act and escape attempts, then arranges for her uncle to reveal the colleague's fake identity. The rival is arrested for fraud, the boyfriend is disgraced, and the protagonist begins a new life.