What made YUJIN become a member of ”SES”? ”I got a business card from Lee Soo-man in Guam” = ”Growth diary of my son in his 40s”

On the SBS variety show "My Ugly Duckling (A Diary of a 40-year-old Son's Growth)" broadcast at 8:55 pm on the 16th, YUJIN was cast (scouted) by SM Entertainment.
On the day's broadcast, Seo Jang-hoon revealed the secret story behind the visual center survey of all the girl groups.
According to Ng, in fourth place was Song Yuri from Fin.KL, in third place was Suzy from Miss A, in second place was Yuna from Girls' Generation, and in first place was YUJIN from SES.
Yujin responded, "Since our debut, we've always had these kinds of surveys," and "We've never missed out on first place." Shin Dong-yup then said,
"We've been on the show together a few times, and during breaks I kept asking my manager's team leader if he'd been investigated today," he joked. Yujin responded, "We'll continue to investigate."
Shin Dong-yup also mentioned the TV series "Penthouse" in which Yujin appeared, saying, "He said that he let out all the anger he had in his life in that series," and added, "In fact, he has done a lot of things."
"Many people said they were shocked," he said. Yujin then quickly acted angry, staring at Seo Jang Hoon and saying, "That Hong Dae building is mine."
Seo Jang-hoon was surprised when he saw it. Yujin also explained the secret behind the casting of "SES". Seo Jang-hoon said to Yujin, "Many fans are wondering why Yujin is making his debut now.
In response, YUJIN said, "I was scouted on the street," and added, "I was in Guam,
"I was a fan of 'HOT' so I went to see their performance," she recalled. "But then the car stopped and I saw Lee Soo-man inside," she said. "I was surprised to see that he was a Korean.
He asked me if I was a foreigner and cast me while handing me my business card."