Comedian Kang Jae-joon joins "1 Night 2 Days season 4" in place of Yoo Seon-ho, who did not participate in the trip due to a back injury.
On the 12th broadcast of KBS2's "1 Night 2 Days season 4," TVXQ! Yunho and comedian Kang Jae-joon appeared as guests as the members were shown heading to Dangjin, Chungcheongnam-do.
In the opening that day, Kang Jae-joon, not Yoo Seon-ho, appeared with the members, drawing attention. The members called Kang Jae-joon "Yoo Seon-ho" and began teasing him, saying, "How could you come to filming wearing a hat?", "How much ramen did you eat to puff up like this?", and "Why have you aged so much?"
When Kang Jae-joon said, "I can't do this. They're tearing into me before we even start," his friend of the same age, Moon Seyoon, cheered him on, saying, "That person is the PD, that person is the writer. You have to look good."
Yoo Seon-ho did not participate because he suddenly injured his back while rehearsing for a musical. He notified of the back injury the day before filming, and Kang Jae-joon was cast; Kang Jae-joon said, "I was supposed to go to Jeju Island for a family trip today but canceled. I received the casting call while with my family, and my wife, Lee Eun-hyung, strongly urged me to go."
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