The head of South Korea's fair trade watchdog said Thursday her agency will review one of two ongoing probes into Google Inc.'s market competition violations.

Since 2016, the Korea Fair Trade Commission (KFTC) has been investigating Google over allegations that it obstructed local smartphone makers from using operating systems from other rivals.

It is also investigating whether Google forced mobile game applications to be only released on its Play store.

"The KFTC is currently conducting a probe related to Google's operating system and another on its app store," Joh Sung-wook, KFTC chairperson, told lawmakers during a parliamentary audit. "We will try to wrap up one of the cases by the end of this year."

The corporate watchdog's stance comes as the US tech giant has recently come under intense scrutiny from South Korean regulators after it adopted a new policy late last month to make all apps on its Play store use its proprietary billing system.

Under the new policy set to take effect in October next year, Google will take a 30 percent commission on all digital content purchases by users.

Joh said she believes Google harmed market competition, using its dominant position.

"The main reason behind Google's decision to take 30 percent in commission is the lack of competition in this market," she said.

"In the KFTC's perspective, Google has taken actions to harm competition."

The tech giant holds a tight grip over local app store sales, garnering a whopping 63.4 percent stake in last year's sales of 6 trillion won ($5 billion), followed by Apple Inc.'s App Store with a 24.4 percent stake with 2.3 trillion won, according to the Korea Mobile Internet Business Association.

Joh added that it is unclear whether Apple holds a dominant position, considering its market share. (Yonhap)