Ryu Seung Soo revealed the unexpected way he became close to Kim Hee Sun.

During his guest appearance on the tvN variety show "Whatcha Up To?" which aired on June 27, the actor was welcomed by hosts Lee Soo Geun, Lee Eun Ji, The Boyz's Younghoon, and, of course, Kim Hee Sun.

While bonding over a few drinks and food, Ryu Seung Soo surprised everyone with an interesting revelation on how he met the "Alice" star.

As the guest and host became comfortable around each other, sharing random stories that they'd experienced, Ryu Seung Soo mentioned the start of his friendship with the veteran actress.

Ryu Seung Soo's 'Bathroom' Incident Made Him Friends With Kim Hee Sun

Ryu Seung Soo narrated it was an unexpected scenario. He teased everyone, saying that whenever he thinks of the actress, there's this "unforgettable incident" that he always recalls.

Ryu Seung Soo revealed that he and Kim Hee Sun were doing an episode for the comedy talk show "Happy Together" at the time.

"After filming, she asked me to eat in Gangnam, so I took her car and went there."

He added that the actress surprised him with a dried fruit and asked him to eat it.

According to him, he also saw Kim Hee Sun eating almost the whole box of the jelly fruit.

However, an unexpected thing happened to Ryu Seung Soo. According to him, after he and the actress went to the buffet, he started feeling uneasy and began feeling discomfort.

"I started to sweat coldly, my face turned pale, and I really needed to p**p."

Unfortunately for him, the establishment had a long line to the bathroom.

"I ran out of the building and went to the next building, but all the bathroom doors were locked.

At that time, I could have caused trouble on the street. I told the owner of the cafe next door that I really needed to use the bathroom, and I found out the password and went out.

I was barely eating when I suddenly started to sweat coldly again."

It was too late when he realized that it was prunes, which are good for constipation and encourage more frequent bowel movements.

While Ryu Seung Soo was recalling the incident, Kim Hee Sun couldn't help but laugh and mentioned that it didn't have an effect on her because she was constipated at the time.

The actor then quipped that he has never experienced something like this in his life and will not forget it.

"Since then, I've become very close to Hee Sun."

Ryu Seung Soo has joined the supporting cast in various K-dramas.

Viewers might have recognized him as scholar Im in "Bloody Heart" and as Kwon Yong Kuk in the iconic series "Winter Sonata."

Meanwhile, Kim Hee Sun stars in her K-drama "Bitter Sweet Hell" with Lee Hye Young, Kim Nam Hee, and Yeonwoo.

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Written by Geca Flores