On June 8 airing of 'Radio Star', Seo Kang Jun revealed his odd reaction to sunlight.

Seo Kang Jun stated, "I lose energy whenever I see sunlight. People don't believe me, but I even got it checked at an oriental medical clinic." He continued, "Filming under the sun in the summer time is the most difficult for me. Even if I don't do anything, I just feel restless after 2 hours."

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Fellow 5urprise member Kang Tae Oh also commented, "Seo Kang Jun doesn't even move when he sleeps. He's so pale, and he doesn't get up when I try to wake him up. Sometimes I fee like he's dead." 

The MCs then responded, "Are you sure you're not actually a vampire?"