Brushing the dust off a safe, Xia Xiaoman entered her mother's birthday—the lock clicked open. Beneath a stack of yellowed lab notes lay three peculiar bank transfer receipts:
| **Date** | **Amount** | **Origin** | **Memo** |
|----------------|-------------|----------------|-------------------|
| 2018.07.17 | $117,000 | Siem Reap, Cambodia | "Seed Funding" |
| 2020.12.24 | $240,000 | Yangon, Myanmar | "Christmas Gift" |
| 2023.03.21 | $333,333 | Luang Prabang, Laos | "Birthday Compensation" |
Her fingers trembled—**March 21st was her birthday**, and **117** was the number of her father's old lab. Even stranger, the sender was signed **"X.M."**, her father Xia Mingyuan's initials.
At the very bottom of the safe sat an old Motorola flip phone. When she powered it on, a single unread message flashed on the screen:
**"The answers you seek are buried in the concrete of the bay. —X.M."**