Noh turned professional in 2007 and successfully negotiated qualifying school for the 2008 Asian Tour.

He won the Midea China Classic that season, and was named Asian Tour rookie of the year.

In 2012, he finished 49th on the PGA Tour money list and 37th in the FedEx Cup playoffs to retain his card for 2013.

[3] In October 2017, Noh announced he would leave the PGA Tour to begin his mandatory military obligation in South Korea, just a few months after countryman Bae Sang-moon returned from his commitment.

[4] Noh made his return to professional golf at the 2019 Shinhan Donghae Open.