The only curiosity I could find was that he graduated from medical school at age 24, but maybe that was normal at that time and place (South Korea, 1969). He is 70—maybe they wanted him to retire.
Edit: According to the 3 reviews on vitals.com, he was arrogant, not fluent in English, rude, and incompetent. But that's only 3 reviews.
Edit 2: The residency is in a county hospital that since 2013 has been managed by a private company under CEO Russell Judd. The hospital had been losing money for years and at this time last year Judd said he was going to lay people off.
Edit 3: They just hired a new CFO this January to help reduce financial losses even more. According to county records, in 2013, Tai Yoo made 364,998.00. It looks like the new CEO and CFO are looking to trim fat at the hospital and reduce losses. When Judd signed on in 2013, he was being paid $366,000 by the county with up to $300,000 a year in incentive pay. It does sound like has significantly reduced losses.