On September 14 episode of SBS' television show 'Dolsing Fourmen', Lee Sang Yun and actress Jin Seo Yeon made a guest appearance.
![Lee Sang Yun](https://img.sbs.co.kr/newimg/news/20210915/201592271_700.jpg)
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](https://img.sbs.co.kr/newimg/news/20210915/201592270_700.jpg)
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](https://img.sbs.co.kr/newimg/news/20210915/201592269_700.jpg)
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."
![Lee Sang Yun](https://img.sbs.co.kr/newimg/news/20210915/201592272_700.jpg)
(SBS Star)