In an interview he had with MBN Star, he said, "I'm like a middle schooler. Siwan is very mature. He's really very adult-like. If I'm next to him, I feel like a baby. His posture and his way of talking is calm, so he feels like an adult. Thankfully, I learn from him, and when I see him, I feel like I have a long way to go."

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Lee Joon, Siwan, and Kwanghee are actually good friends of the 88'line. Kwanghee actually has shared a KakaoTalk chat he had with Lee Joon, and the trio frequently hang out together.

He also said, "Even though not in detail, I have a plan that fits my age. I think in life, setting big goal and chasing after it gives energy. I believe that even unrealistic dreams make you mature."