Career
At the 1964 Summer Olympics in Tokyo, he was eliminated in the semifinals of the K-2 1000 m event. Four years later in Mexico City, Joo was eliminated in the semifinals of the K-1 1000 m event and in the heats of the K-4 1000 m event.
At the 1964 Summer Olympics in Tokyo, he was eliminated in the semifinals of the K-2 1000 m event. Four years later in Mexico City, Joo was eliminated in the semifinals of the K-1 1000 m event and in the heats of the K-4 1000 m event.
