The Japanese government complained about this transaction, so the Chinese took their money back and these two vessels joined the Kriegsmarine after the outbreak of the Second World War in Europe. They were U-120 and U-121.
The Japanese government expressed dissatisfaction with this transaction, leading to the Chinese reclaiming their funds. As a consequence, these two vessels, U-120 and U-121, were incorporated into the Kriegsmarine during World War II.