Lee Mijoo exposed the betrayal of her ex-boyfriend in the past. On the February 16th broadcast of the SBS variety show "No, But Really," Lee Mijoo shared her painful past experience. The show featured MCs Tak Jaehoon, Lee Sangmin, Lee Suji, and Kai, along with Lee Mijoo, Lim Wooil, and Jo Hyunah.

Lee Mijoo explained the story of not being able to meet her boyfriend on Christmas. She said, "It was a long time ago on Christmas. I couldn't meet my ex-boyfriend because of work. I told him in advance." However, the next day, she received shocking news from a friend. The friend asked, "Do you know this person?" and revealed that her boyfriend had invited an older female member of the same group out on Christmas. Lee Mijoo said, "She said the older sister still hadn't come home."

Afterward, Lee Mijoo told her boyfriend about this, but he denied it, saying, "Absolutely not." Lee Mijoo added, "There was no evidence, and it was true that he was unreachable, so he kept denying it. I just said let's break up. I really didn't want to break up, but I was so upset that I ended it."

Lee Sangmin asked, "If you see your friend's partner cheating, should you tell them?" Tak Jaehoon, Kai, and Lim Wooil all said they would pretend not to know. Tak Jaehoon said, "Men don't usually talk about these things." Kai shared, "You should tell them, but sometimes people don't. I've actually told someone before. I told them, but they didn't break up."

Lee Mijoo knew that a man her friend was dating was in a long-term relationship with someone else and said, "I told her right away. I said she shouldn't meet that trash." When Jo Hyunah said, "You told me before," Lee Mijoo replied, "Right. I also told my older sister. She talks about being happy, but I know the truth. She can't be happy."

Jo Hyunah asked, "Why not?" and the two talked all night. When Kai asked, "Did they break up because of that?" Jo Hyunah answered, "Not immediately." Tak Jaehoon asked, "Did Lee Mijoo like that person?" Lee Mijoo explained, "He liked me too. At that time, when he was telling my older sister he liked her, he was also saying the same to someone else and begged me to date him while crying."

Jo Hyunah expressed gratitude for Lee Mijoo's help, saying that during a late-night call, Lee Mijoo told her, "We can have a three-way call, so just say I told you." Lee Mijoo emphasized, "He was really trash." Lee Suji asked, "Please just say one initial clearly."

This broadcast attracted viewers' attention by revealing the past story of Lee Mijoo and Jo Hyunah being caught up in a man's double dating. "No, But Really" airs every Monday at 10:10 PM.