On the August 15th installment of JTBC's 'Witch Hunt', Sung Si Kyung talked about a high school sweetheart, revealing that he thought he was going to marry her.

The singer shared that he had an unrequited crush on her, and she eventually became his first girlfriend. He said, "I got a girlfriend in my junior year of high school. It was exam time when I came home and said I was going to get married, so my parents were really shocked. I met her at an educational institute when I was a sophomore in high school, and I liked her so much to the point I thought I needed to marry her. I was unable to manage my feelings, so I went home and instead of saying, 'I got a girlfriend,' I said, 'I got a girlfriend, so I'm going to need to get married.'"

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He continued, "But my father took me to a sauna and advised me quietly, 'Shouldn't you meet three to four women before getting married?' At the time, I was really against the idea, but looking back later, I found those words to be true."