IBK's China unit lost 83 billion won because one platform held both the cash and the ledger

Put the bank's own figure against the regulator's own dates and you get a daily rate. The Financial Supervisory Service times the fraud from December 1 to June 29 ^[10], a span of 211 days ^[18]. IBK's disclosure last month put the total at 83.376 billion won ^[12]. That is roughly 395 million won a day of borrower principal and interest going somewhere other than the bank ^[19], for most of two fiscal halves.

The reason a daily check could not see it is structural. IBK disbursed the loans itself, but repayments travelled through an account designated by Company B, the online lending platform, and were settled with the bank later ^[4]. Company B changed that account and kept the money ^[5], then processed false computer records showing repayments that had never been transferred ^[6]. IBK says it compared repayment records against actual deposits every day ^[8]. Both sides of that comparison originated with the same counterparty, so the check could clear every morning and prove nothing. What actually broke the case was settlement money failing to arrive on June 24, plus rising borrower complaints ^[9], about 206 days after the diversion began ^[20]. The FSS window runs five days past the date IBK says it noticed ^[22].

A cheaper signal was on offer earlier. Five Chinese financial institutions removed Company B from their partner lists in March and April, and IBK did not pick it up ^[11]. Taking the later of those two months, that leaves at least eight weeks in which the platform collecting IBK's loan repayments was being dropped by local peers while IBK kept lending through it ^[21].

The remedy is the most telling detail. IBK has now built a separate system letting borrowers check repayment amounts or repay early without going through Company B ^[14]. That is not sophisticated engineering. It is the arrangement the product needed on day one, and building it now concedes the design was the exposure. In the meantime, borrowers who had cleared their loans were recorded as in arrears or default, pursued by collections and marked down on their credit scores, while IBK failed to recover the principal and interest ^[7].

Two months after becoming aware, the bank still cannot state the actual amount involved, the sum recovered or the expected loss, and points to a local investigative agency ^[13]. The supervisor's posture matches. After the case was reported, the FSS filed internal reports, circulated it and checked whether the amount had changed, but did not begin face-to-face verification with IBK officials, request further materials, or open a written probe or on-site inspection ^[15]. It says it will review the appropriateness of the handling once IBK submits a closing report after cleanup, including recovery of the losses ^[16]. According to Rep. Shin Dong-wook of the People Power Party, who obtained the materials from the FSS and IBK ^[2], IBK "handed out the loans directly but left the collection of principal and interest to an outside platform," and the FSS's "belated oversight, simply waiting for a closing report," is a serious problem in its own right ^[17].

For any lender running outsourced origination or collection rails, the transferable lesson is narrow and unglamorous: the party that holds the account of record cannot also be the party that supplies the record.