Most Korean high school players are draft picks of the Korean Baseball Organization and Hyun-il Choi could have been a top draft pick in Korea Baseball, but chose to sign with the Dodgers. He made his pro debut as a 19-year-old in the Rookie-level Arizona League in 2019 where he went 5-1 in 11 starts with a 2.63 ERA. What jumps out is that he struck out 71 batters in 65 IP and only walked 11 batters. He finished with a 1.05 WHIP.
Of course, Choi lost a year to the pandemic, spending the 2020 season back at home in Korea.