On September 14 episode of SBS' television show 'Dolsing Fourmen', Lee Sang Yun and actress Jin Seo Yeon made a guest appearance.

As Seoul National University is the top university in Korea, the hosts gasped in surprise.
With a shy smile, Lee Sang Yun said, "I majored in Physics at Seoul National University."

Lee Sang Yun answered, "I actually wanted to become a professor before."
After that, the hosts started to wonder whether Lee Sang Yun was popular at Seoul National University for his good looks, like actress Kim Tae-hee when she was a student there.
Lee Sang Yun laughed and said, "No, no. I wasn't at all."

Lee Sang Yun laughingly responded, "Well, I wasn't popular as far as I know. I at least didn't hear anything like that from people around me."
He continued, "Honestly though, nobody was interested in things like that, because they were all too busy with their studies."

(SBS Star)