He went on a trip to Japan and met a girl who was just so cute and petite. He got her number and they started dating. When she said she was coming to Korea and suggested living together, he said yes immediately because he liked her so much. However, due to the nature of his work, he often comes home late, and he's usually with other women when he does. He doesn't actually cross the line or cheat, but he's being quite insensitive. He knows a little bit of Japanese, but he's far from fluent.