On the June 2nd installment of 'Knowing Brothers', Seolhyun and her fellow AOA member Jimin as well as Kim Shin Young featured as guests. The three of them revealed they went on a trip to Vietnam together, and Jimin and Kim Shin Young attempted to do a hidden camera prank on Seolhyun.
Seolhyun saw that the two kept whispering in each other's ears, and she expressed she was upset by it all. Kang Ho Dong asked if she wasn't getting enough affection, and she responded, "I don't suffer from a lack of affection, but I'm a bit obsessive."
When Kang Ho Dong suddenly said 'Knowing Brothers' castmate Min Kyung Hoon doesn't like obsessive women, Seolhyun replied, "I don't really like Min Kyung Hoon either."