On the 9th, Jo Hye-ryun expressed her emotions while talking about her son Woo-joo on MBC's variety show "Haengnim, What Are You Doing?" The episode featured Haha, Lee Yi-kyung, and Joo Woo-jae continuing their two-day, one-night friendship trip in Sangju, Gyeongsangbuk-do. During the trip, the three stopped by a café, where Jo Hye-ryun and Heo Kyung-hwan appeared as surprise guests, lifting the atmosphere even more.

As soon as Jo Hye-ryun appeared, she asked, "Is Yoo Jae-suk not here?" which brought laughter to the cast and viewers. During the car ride, she talked about her son Woo-joo's independent challenge. Jo Hye-ryun said, "Woo-joo is 23 years old today and is going to the United States. It's not for studying abroad but to learn and train with the Bible. After that, he will go to Sydney for working holiday."

Jo Hye-ryun mentioned that she prayed before sending her son off, and her emotions welled up. She said, "I wrote long letters on both sides of the front door. My son grew up and wrote a long letter," tearing up. The letter contained her son's sincere confession: "I really respect you, Mom. Seeing you work so hard even when your voice is hoarse and your body is tired made me think I should work hard too."

Jo Hye-ryun also revealed that her son called his stepfather "Dad" for the first time. She said, "He used to call him 'mister,' but in the letter, he wrote 'To my beloved Dad,'" and broke down in tears. Heo Kyung-hwan comforted her, saying, "That attitude is learned from parents. You're the one who does that."

Lee Yi-kyung suggested that Jo Hye-ryun call her son. During the call, Jo Hye-ryun expressed her heartfelt feelings: "I'm sorry I couldn't express warmth. I'm sorry I couldn't see your face this morning. I'm happy to have given birth to you, and I love you." Hearing this, Haha, Heo Kyung-hwan, and Lee Yi-kyung teared up. Joo Woo-jae admired, "That kind of call was something you only hear about in fantasies."

Haha shared stories about his own children, saying, "The kids went to school, and I called Go-eun, who was upset. We decided not to scold them the night before, but in the morning, I scolded them again," revealing his feelings as a parent. Jo Hye-ryun encouraged him, saying, "It felt like a very long tunnel. It seemed endless, but the kids are still teenagers, and they don't grow up as I want, but it ends when they turn 20. When they think for themselves and are embraced with love, that's when the child grows well."

"Haengnim, What Are You Doing?" is a spin-off of MBC's variety show "Hangout with Yoo." This program captures the cast's daily lives and emotional moments, deeply touching viewers. Jo Hye-ryun's honest story and love for her son resonated with many.