On August 18 episode of JTBC's television show 'Serimoney Club', Kim Jong-kook mentioned his dating style.

He added, "I'm a quiet person as well. I once had a girlfriend who was similar to me. Actually, she was even worse than I was."
He laughingly continued, "When we met, we only said the things that we had to say to each other and did our own things. Many looked at us weirdly."

The singer resumed, "There were emojis that I could use, but I had never used them. I was pretty cold via texts. But when I was with her in real life, I would be a gentleman."
He went on, "We fought about me going to the gym too much though. My work-outs were the biggest obstacle in our relationship."
He added, My girlfriend would ask me, 'Is your work-out more important to you or am I more important to you?'"

(SBS Star)