After returning from a business trip, ordinary homeowner Su Qing is shocked to receive a 5,000-yuan fine from the property management for supposedly carrying out unauthorized renovations. But she hasn't even touched a hammer in her brand-new apartment. As she investigates, she discovers that homeowner Lin Kun and the property manager have conspired to frame her. Revealing her dual identities as a structural engineer and a public-interest lawyer, Su Qing follows the trail and uncovers Lin Kun's crimes, including demolishing load-bearing walls and embezzling public funds to hide stolen money. The investigation also exposes long-buried grudges between their fathers' generations. Fearlessly confronting the criminal forces behind the scheme, she ultimately ensures that every villain pays the price under the law.