The Indian team, in contrast, went into a huddle after V M Ranjeet and Vijayant Malik lost in contrasting fashion in the opening singles.
While Ranjeet went down tamely to Min Hyoek Cho, Malik lost steam against Suk-Young Jeong after putting up some fight to start with.
Malik was forced to concede the match due to cramps in his left leg and could not turn up for the routine press conference as he was taken for treatment.
Meanwhile, a relaxed Yoon was candid enough to admit that the visitors were nervous.
"Since this is an away tie for us, we were nervous when we came here," said Yoon through an interpreter at the end of the day press conference.
"The first match went very well for us but the second match was tough. Overall, it was easy but this is not the end and we will try to get the doubles match tomorrow," he said.
Leander Paes, the only top player in the hosts line-up, and Purav Raja will take on Yong-Kyu Lim and Ji Sung Nam in the doubles rubber tomorrow. MORE