February 12, 2015 at 08:35 PM EST

The Walking Dead‘s Steven Yeun took Conan O’Brien to an authentic Korean spa on Wednesday’s episode of CONAN, and O’Brien was clearly unprepared for the pain he was about to endure (and the large amount of nudity he would face).

The two visited Wi Spa and stripped down for a not-so-relaxing day of super-steamy saunas, extreme-temperature pools, and a cringe-inducing scrub that removed skin O’Brien had had since the Carter administration. Yeun battles zombies for a living, but this trip to Koreatown might have more lasting effects. 

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