After more scholarships she moved to New York in 2008, where she completed her master's degree at the Manhattan School of Music, among others with Jay Anderson, John Riley, Phil Markowitz, Dave Liebman and Rodney Jones as supervisors.

In 2008, she released her debut album Entry with own compositions and a cover version of Red Hot Chili Peppers Oztrax, with the trumpeter Ambrose Akinmusire and drummer Obed Calvaire.

[2] Oh also contributed to albums with the alto saxophonist Jon Irabagon (Outright, 2008), Sarah Bemanning (Løvetann Klokke, 2010), Brian Girley (Tro, 2011) and Art Hirahara (Hygget & Meditasjoner, 2014).

[3] In 2012, the album Initial Here with pianist Fabian Almazan was released,[4] followed by Sun Pictures (Greenleaf), among others with Ted Poor.

In addition, she has performed with Slide Hampton, T. S. Monk, Nathan Davis, George Kabler, James Morrison, Nasheet Venter, Joel Frahm, Pat Metheny, Steve Wilson and Billy Childs.