SEOUL, July 2 (Reuters) - South Korea expressed regret on Thursday that a report by a U.S. House panel on Seoul's treatment of U.S. businesses reflected mostly one-sided claims by U.S.-based Coupang CPNG.N, which has been probed by South Korean authorities over a massive data breach last year.

South Korea has conducted a probe on Coupang in a nondiscriminatory manner according to law and fully guarantees a fair business environment for all companies regardless of their nationality, South Korean Foreign Ministry spokesperson Park Il said.

"The reports claim that this government is continuing a discriminatory investigation and unfair regulation against Coupang is untrue," he told a briefing.