On a recent episode of MBC‘s Radio Star, Jun Jin confessed to feeling guilty and humiliated about a campaign song Shinhwa sang back in their earlier days.

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During Shinhwa’s earlier days, an incident occurred which caused Jun Jin to hide behind the other members in shame.

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The song in question was an anti-smoking campaign called “A Day of the Lung.”

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And Jun Jin felt guilty and humiliated for one reason.

There were smokers in our group. We filmed for a good cause, but I felt so guilty.

— Jun Jin

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In the revealed clip, Jun Jin, who was always active in the center as the main dancer, kept hiding behind the other members.

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When Kim Goo Ra noticed Jun Jin hiding, Jun Jin didn’t deny it in the slightest.

I was avoiding the camera from beginning to end. I’m behind the other members.

— Jun Jin

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Although they filmed with the best intentions, Jun Jun confessed that he still feels guilty to this day.

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Check out the full clip below: