Why 500 billion?

Contract with Act Geo – 5 boreholes – KRW 100 billion each – Total KRW 500 billion

Why 5 boreholes?

https://www.youtube.com/embed/05q_bSJhzOM?si=d4aeRiQD66f_iDL0

The person on the 5th floor really likes the number 5 ~~~~

https://www.youtube.com/embed/mUmTDIgTg18?si=BdYE5vPQxt3G9bpj