On June 29 episode of KBS' television show 'Problem Child in House', Go Doo-shim made a guest appearance.

While on the topic, they asked if there was a particular star who she remembers the most.
Go Doo-shim answered, "Yes, there is. I remember IU the most. We acted in KBS' drama 'You Are the Best!' in 2013 together. She was my daughter in it."
She continued, "IU is small, but has such a big heart. She's so kind and thoughtful. We still keep in touch with each other every now and then."

Go Doo-shim said, "I felt so grateful for that. She wrote, 'Dear my beloved mother Do-shim' on the truck as well. As IU was filming something at that time, I treated her with a snack truck too."

The actress said, "In 'Everglow', one of IU's songs 'Through the Night' gets played. Ji Hyun-woo and I sing the song together a lot as well. It's almost like the main soundtrack of the movie."
She resumed, "When I told her that we wanted to use the song for the movie, she was like, 'Sure! Just use it! Use it as many times as you like. It's no problem.'"
(Credit= KBS Problem Child in House, 'dlwlrma' Instagram)
(SBS Star)