Yeo won the gold medal on vault at the Melbourne World Cup. This was the first time that a Korean female gymnast won a gold medal in the FIG World Cup series. At the 2019 Korea Cup, Yeo became the first woman to land the handspring double twist vault. She said of the new vault, "I was afraid, but once I started focusing on the competition, my fear disappeared. I am so happy that I was able to execute that. I wanted to land the new vault regardless of my final rankings today, and everything went my way." The vault was then named after her and added to the Code of Points. At the World Championships in Stuttgart, Yeo qualified to the vault final in fifth place with a score of 14.766. However, she finished last in the final after a fall and going out of bounds when attempting the handspring double twist vault. Because she qualified for the vault event final, Yeo qualified as an individual for the 2020 Olympic Games. After the World Championships, she competed at the Swiss Cup alongside Lee Jun-ho, and they finished seventh in the team competition.