HRS §490:3-601
Discharge and effect of discharge
This section says when a person's duty to pay a negotiable instrument ends. It can end by rules in this article or by an agreement that would cancel a simple debt. But that ending does not work against a later innocent buyer who did not know about it.
everyone
The statute, as written — Discharge and effect of discharge
(a) The obligation of a party to pay the instrument is discharged as stated in this article or by an act or agreement with the party which would discharge an obligation to pay money under a simple contract. (b) Discharge of the obligation of a party is not effective against a person acquiring rights of a holder in due course of the instrument without notice of the discharge.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.